How FOUCAULT PENDULUM Works and Proves Earth is a Round SPINNING Sphere

[@lospazio]

There are several videos on KZbin that claim to explain how the pendulum works, but this is the only one that I have found that clearly addresses the movement at any point on the surface of the Earth and not just at the poles and the equator. Thanks for the effort.

[@lightninlad]

I am copy pasting my comment from above so that you see that this isn’t a definitive explanation for how this pendulum works. See below 👇: Yikes-the Foucault Pendulum strikes again! This is NOT evidence that the earth rotates. Sorry folks. This USED to be considered a reliable “proof” that the earth rotates but the “general principle of relativity” changed all that. That’s because the principle allowed for both a “geometric” equivalence AND a “dynamic” equivalence. In other words, there are not one ☝️ but TWO ✌️ explanations for the pendulum’s behavior: 1. The pendulum is behaving this way because the floor is turning with the rotating Earth because the Earth’s gravity is pulling on the floor but NOT pulling enough on the free-floating pendulum. OR-and this is the part no one realizes… 2. The fixed Earth’s gravity will hold the floor still, but the rotating universe will create the centrifugal and Coriolis forces that pull the free-floating pendulum so that it turns against the fixed floor held to the fixed Earth. This is why Einstein wrote: Albert Einstein: ”…to the question whether or not the motion of the Earth in space can be made perceptible in terrestrial experiments. We have already remarked that all attempts of this nature led to a negative result.” Source: * Relativity - The Special and General Theory (1916), Part I: The Special Theory of Relativity, Experience and the Special Theory of Relativity So while it is a very nice pendulum indeed-it doesn’t actually “prove” anything.

[@sissyfus6181]

@@lightninlad Yo, Spam a lot, what's your highest level of completed physics?

[@esphilee]

And the music does help.

[@felipedantas8153]

Eu não conseguir entender onde o pêndulo é fixado que o deixa livre da rotação da terra.

[@gabrielj6609]

​@@felipedantas8153inércia cara. Se vc estiver girando em gira gira em um parquinho e jogar uma bola, a bola não vai acompanhar o giro do gira gira.

[@MarkAMMarrk]

Thanks! I've wondered about how it worked "off-axis" for 50 years! Yes... I saw my 1st Foucault at the Griffith observatory as a child.

[@StickScience]

Thank you for your support. I'm glad my video helped!

[@davidesimonetti8989]

the Griffith observatory was also where I learned that it's not every 24h, and that's where it stumped me... I'll need to rewatch this video a few times before actually understanding it fully tho!

[@joesmith-es1zy]

@@davidesimonetti8989 The time it takes to complete a rotation is based on it's placement on the Earth, latitude and longitude.

[@stevekoski8643]

@@joesmith-es1zy Just latitude, not longitude.

[@nick066hu]

Proves Earth is a Sphere: proves to those who already know. For a flatearther I can't imagine anything to prove him anything.

[@wmickinley]

proves to those who already know.

[@StarFreut]

@@wmickinley LMAO

[@sebastianpostigo4025]

El terraplanismo es casi una religión, da igual las pruebas y argumentos que les digas, jamás les harás cambiar de opinión, te lo digo como alguien que ha peleado con estos y rechazan TODAS las evidencias diciendo que son preparadas, que es CGI, etc. Siendo que es muy sencillo de entender

[@nick066hu]

@@sebastianpostigo4025 De acuerdo. Hace tiempo que aprendí a no discutir con gente así, nunca he visto a nadie a quien se pueda convencer.

[@sebastianpostigo4025]

@@nick066hu Exactamente, un dato curioso que me ha llamado mucho la atención Es que estas personas son las que más dicen “que investigan y cuestionan todo” pero siempre cometen falencias enormes Es como viajar en el tiempo porque hacen caso omiso a un montón de estudios científicos, escuche a un terraplanista decir “El modelo de la tierra esférica está incorrecto ya que hace la SUPOSICIÓN de que la tierra está a 150 millones de kilómetros” Esto se sabe desde el siglo 18 (mediante el paralaje) Me impresiona como gente dedica SU VIDA a “investigar” estas cosas, pero omiten todo esto No se, me llama la atención que personas que se dicen “las despiertas” no se percaten de cosas como están, es como si investigasen estando dormidos Disculpa por el texto tan largo

[@DanSirGalahad]

You lost me at cone

[@misc_things]

Yeah, the earth got a party hat and I couldn't focus on anything else.

[@lovemanu00]

😅

[@joshfranklin9941]

If you actually cut a circle out of a piece of paper and do what he does, it'll be easier to understand.

[@tomcass240]

This video really sucks. I can understand the math but there's 0 explanation of why this cone analogy works in practice, it's like a huge part of the explanation is just skipped over because the OP likely doesn't understand it either, which is why you don't hear the words "coriolis force" once in this video.

[@rocketspushoffair]

@@tomcass240 Here is the pendulum scam exposed by Dr Shoepfer who usd to build Foucault pendulums back in the day flatearthtextbook.blogspot.com/2016/11/our-earth-motionless.html Coriolis can only be a thing if spin was ball earth's only motion. You must do vector addition for the COMBINED EFFECT of all motions. Wee can debunk the globe by doing this for just 2 motions: spin + orbit + 21 mm/s/s alternating accel/decel every 12 hours or half revolution, experienced by everything on earth's surface, where is it? Nowhere! A rock balancing statue proves motionless earth. kzbin.info/www/bejne/d5eok6akhL2ljpI Rigid body rotation with translation is the physics. Note the word "rigid" because only solid bodies can spin like a top see flat.wtf [ flatearthclassroom.blogspot.com/2020/11/centrifugal-force-based-on-rotation-axis-of-body.html ] And that's the end of the glob!

[@flyingsodwai1382]

I thought everyone I worked with was stupid. After watching this I now understand how they feel when I talk.

[@ralanham76]

😂

[@joshfranklin9941]

You have to pause and work out all the math for yourself!

[@Adam0Jen]

Beautiful comment

[@Jimmyjimjimjim]

Narcissist comment

[@scyrma]

Nice video, good explanation, well done. Why the background music though? Does it really add anything? I find it quite disruptive.

[@emfyates]

Thnk you for this! The visualization and equations really helped me understand this better.

[@andreaswolf499]

Great explanation but I had to stop mid video because once you notice the insanely annoying music you can’t focus on anything else. Very good visualizations still.

[@betula-pendula]

Best explanation ever. Thanks. Now I understand the Focaults pendulum.

[@DarthVader-ch4um]

Good job Pendula!

[@luisbreva]

You can visualize the weird properties of quatum spin like this too. An electron is like a Foucault pendulum that needs 2 Earth rotations to look the same

[@raysearch-iu3fr]

Thanks for that! That's very insightful. So Electrons have a spin value equivalent to a Foucault pendulum operating at latitude 30 degrees. There, Coriolis forces tend to produce calm winds and desert climates. Light. Interesting.

[@kirkmorrison6131]

As a teenager I sat and watched the one at the Smithsonian for a couple of hours, it was fascinating to watch it move around the circle

[@frankhooper7871]

I did the same at the Griffith Observatory in Los Angeles back in the '60s 🤓🌐

[@kirkmorrison6131]

@@frankhooper7871 it was neat watching it move and pass the markers.

[@scottk3292]

Very cool pendulum at the Smithsonian. When I saw it, I wondered whose job it was to walk around at the end of the day and set up all those little pins that the pendulum knocks over.

[@kirkmorrison6131]

@@scottk3292 I did too

[@kfm908]

and this proved rotation of earth,right?Wake up! Watch Foucault pendulum prove Earth's rotation by Eric Dubay

[@NoiTuLovE64]

The crux of the matter that plagues flat earthers is Crux Constellation also known as Southern Cross. ALL the visible constellations that rotate around the earth's fixed axis pointing to Polaris North Star (north) and Crux Constellation (south) ALL together show us that a flat earth is literally impossible.

[@ruledbysaturn]

So looking at the sky tells you the shape of your earth? That does seem logical, actually there's no logic in that at all.

[@MelioraCogito]

@@ruledbysaturn _“So looking at the sky tells you the shape of your earth? That does seem logical, actually there's no logic in that at all.”_ That's because you lack the intelligence and reasoning skills to think logically. Which is proven when Flerfs claim their sun is a 51.5 km (32 mi) diameter object (you can't even agree on what shape it is: spherical/disc (thickness?)/flashlight/WTF?), circling over the FE at 4'828 km (3'000 mi) altitude (give or take[¹]), it can appear to set (fall; drop) below the plane of the horizon, when, from the furthest vantage point anyone might be able to observe it on the FE (theoretically at least, when _zenith_ to the Tropic of Capricorn it is observed in opposition from the South “Pole” Rim), its elevation would still be 10° above the horizon! THAT is not an insignificant elevation angle. As seen from the North Pole, it would NEVER fall below 31° elevation, ABOVE the horizon when _zenith_ over the Tropic of Capricorn; and its elevation would never fall below 45.7° above the horizon when it's _zenith_ over the Tropic of Cancer. And yet you argue there's “logic” to the assertion it can “appear” to fall below the horizon, while 31°-45° above it! 🤔 Please do elucidate us, ol' wise one. [¹] Samuel B Rowbotham (Parallax) claims it's _“not more than four thousand miles”_ in altitude, but his calculations suggest it's much lower than even 3'000 miles, if you do the trigonometry of his calculated angles and the distance between his observation locations in England-which he claimed were on the same meridian (they weren't)-as published in his book _Zetetic Astronomy-Earth Not a Globe!_ 🤔 Where's the “logic” in that absurd nonsense?!? Then there's the lack of a _“logical”_ explanation as to why we don't have hurricane force winds (or hear sonic booms) _every day_ caused by a 51.5 km diameter object (the sun) passing overhead, speeding through the atmosphere[²] at: Mach 1.57 (1'940 km/h or 1'206 mph) when _zenith_ to the Tropic of Cancer; at Mach 2.12 (2'623 km/h or 1'630 mph) when _zenith_ to the Equator; Mach 2.68 (3'306 km/h or 2'055 mph) when _zenith_ to the Tropic of Capricorn; and/or all Mach speeds in between as it moves between latitudes over the course of the seasons. [²] The entire volume of space between the FE surface and the _impenetrable_ “firmament dome” is filled with an inert gas (atmosphere) under pressure (~1 bar; 1'013 hPa; or 14.696 psi), which according to you “logical” dullards, keeps us all pressed firmly down upon the Earth's surface. (NOTE: Without gravity, _there is_ no _atmospheric pressure gradient_ with an increase in altitude; no _atmospheric pressure gradient_ means no _“lensing effect”_ in the atmosphere, since lensing occurs only when light passes through transparent mediums of differing densities.) You more-ons can't even agree on what the radius of the Equator is, for that matter-🤔 is it 6'378 km (3'963 mi) as measured on the globe Earth, or is it 10'019 km (6'225 mi) as measured by the arc segment distance between the North Pole and the Equator (on a globe Earth)?!? (The elevation and speed of the moving sun provided above are based upon the latter equatorial radius.) I could go one, but I honestly don't have the time or the crayons to explain the rest to you. When brain-dead and shamelessly stupid Flerfs claim to have a monopoly on logic, all I can think of is: _‘how Dunning-Kruger of you’._ *Dunning-Kruger:* _'Those who know the_ *least* _think they know the_ *most.'* *Tuteur Corollary:* _'If they don't understand it, they think it's a plot to harm them.'_

[@aceshelman]

@@ruledbysaturn too much for your small brain I guess.

[@ruledbysaturn]

@@RogueInsect Cheers indeed.

[@ruledbysaturn]

@@RogueInsect Sticks ? Huh. Lmao yer funny.

[@Ezinma88]

Loved it. Didn't get the maths. But, in general very clear. I needed the visuals.

[@kenea3226]

So far this is the best explanation I have seen. 👍🏽

[@p.moorewilson7917]

Reminiscent of Mrs. Curtis’ Physics class back in the 70s. Most of this explanation went over my head, but I DO trust (and comprehend) that Foucault figured out something extraordinary, even if I only barely understand it. I also finally get why there are flat earthers: they don’t trust what they don’t understand and they don’t trust that there are people out there who are smarter than they are 😕🤷‍♀️

[@stuartgray5877]

Think of it this way: If you ring a bell, then rotate the bell while it is ringing, do the vibrations move with the bell? Or do the vibrations stay stationary while the bell rotates? This is the same concept.

[@edgararcega3046]

We need dumbed down version of this for flerfers. Dumb it down to pre-school level please

[@Capt-Intrepid]

This video is no good. Here is a MUCH better one that explains Foucault Pendulum. Search for this on KZbin: Foucault Pendulum- Oh so Simple! PERMANENTLY CURIOUS

[@yog146]

How can I do this at home

[@dre8485]

You can't

[@BronzeDragon133]

@@dre8485 Incorrect. Just make a really, really long--as long as you can--wire string in a place where it will be undisturbed. Homemade ones often use stairwells and have limited swings of ten to twenty degrees, but that's enough for proof of concept. The longer the line, the slower the pendulum, which is important to limit air resistance (it won't move quickly, and won't drag against air). Use a wire rated for the weight. You'll want a fifty pound lead ball with a hanging hook on it, or something like that, that will swing for at least an hour without losing too much to air resistance. The top hook should be able to rotate freely. Hooks that can't won't be able to move with the Earth as it rotates. Start the ball and let it swing. You can let a string soaked in ink drag off the bottom onto printer paper, leaving a mark as it goes (this will slow the pendulum over time, too). Come back in an hour and you should see the markings move--from not at all at the equator to 15 degrees at the pole.

[@stuartgray5877]

The way that I learned to visualize the "Foucault effect" is: Imagine viewing the earth spinning from the spin axis vector looking down towards the center of rotation of the earth (very far away, neglect perspective). From this vantage the equator is a perfect circle. (Lets call this the "High vantage point" or HVP) Now imagine placing the swinging pendulum at the north pole. From the HVP, the pendulum is swinging "in a plane" that is normal to the viewing vector. (Gravity vector for pendulum and viewing vector are the same) At this point the pendulum will have the greatest rotation visible from the surface (effect of 100% or 1.0X). Now if you relocate the pendulum in a different location on the earth (for the sake of simplicity lets always imagine the swing beginning in a local "north south" orientation), imagine what the swing "looks like" from the HVP. at 45 degrees latitude the plane of the swinging pendulum is tipped 45 degrees from the HVP. So, the viewer "Sees" less of the swing of the pendulum. (about 70% or Cos(45)) Now move to the equator and the plane of the swing of the pendulum is tipped completely 90 degrees to the HVP. (Gravity vector for pendulum and viewing vector are perpendicular) So, you can't really "see" the swing of the pendulum at all. This is the point where the effect is minimal or 0X. (0% or Cos(90)) It is how much "Cross section" of the swing can be "seen" from the HVP that determines the magnitude of the effect. In Engineering terms, it is also called the "Cosine Loss" similar to the power on Solar arrays as you tip them away from normal to the sun, or how much cross section of an electrical coil is exposed to a magnetic field as it rotates.

[@wyominggirl2835]

So what does the pendulum have to do with anything? Why are we using a pendulum? The earth isn't on a swining string or an invisible string swinging so how can we compare a pendulum to earth?

[@stuartgray5877]

@@wyominggirl2835 Well you could research the gyrocompass for the next iteration of the technology. Care to tell us how IT works? Then I could explain the fiber-optic gyros as well.

[@matrixception-uo2di]

So helicopters should not be able to horizontally take off and land in the same spot

[@stuartgray5877]

@@matrixception-uo2di Learn about "Conservation of Momentum". High school physics is a good start.

[@matrixception-uo2di]

@stuartgray5877 learn to understand a point and a paradox and maybe you'll figure it out

[@ricardoavilapaulette7060]

Thanks. For me the ball hanging from a high ceiling is still. The earth, the planet is the one that rotates. As much as the earth rotates the the sun and not the sun the earth. A clear ecplanation. Thanks again.

[@jessevanderhamm]

But then why do the pendulums swing clockwise sometimes and counterclockwise other times? Wouldn’t it only swing in specific directions?

[@sissyfus6181]

They "swing" or precess clockwise in the northern hemisphere and counterclockwise in the southern hemisphere. Hope that helps.

[@mmaniac-z1z]

that is correct.

[@daksharora928]

I dont know if you take doubts, but if anyone else can clear it up that would be nice too, why a circle and a cone? I simply dont understand the logic behind it. How do you define what is "fixed" in the pendulum when you are taking it at a latitude different from the poles

[@astronxxts]

the creator doesn't know why either

[@MysteryBTDN]

The earth rotates around its axis, thus any object that is stationary will move in a circle with the rotating earth. As for the cone, you obtain it by drawing a line from the pendulum perpendicular with the earth to the closest pole. That's why the cone becomes a cylinder at equator, since the perpendicular lines will never converge. Fixed just means stationary on the earth, i.e. not in orbit.

[@AlexeyAstafyev]

where can i see the footage of the foucault pendulum in the southern hemisphere? australia? south america? send a link to the video. really want to see

[@renedekker9806]

Search for "Foucault pendulum video Australia" and you'll find some.

[@russhamilton3800]

Maybe someday if they ever connect all the computes, they could call it the interlink and have a way to keyword search things and call it google, maybe someday....

[@frankdrebin2343]

can you explain how they get a 'fixed point' for the pendulum since it's hooked up to a building which is on the earth and therefore spinning as well? The animation makes sense when you can hook the pendulum to nothing in the air, but does it still work when the 'fixed point' is actually moving just as much as an observer on the ground?

[@frankdrebin2343]

all Foucault's pendulums in universities/museums have an electro magnet to keeps it swinging. Couldn't that same electro magnet be giving it the slight spin clockwise/counter clockwise depending on how they set it up?

[@sissyfus6181]

@@frankdrebin2343 "Couldn't that same electro magnet be giving it the slight spin clockwise/counter clockwise depending on how they set it up?" Yes they could. But they are set up so that they DON'T impart a bias in the swing. What's more, a whole lot of pendulums have been done without the motor. They eventually stop swinging, and the results show the precession very clearly. You don't need the "motor" to do a Foucault pendulum.

[@frankdrebin2343]

@@sissyfus6181 thanks for your reply. I've seen videos of non-motor pendulums. Like you said, they do stop fairly quickly. It would be interesting to see exactly how the magnet works and if it does or doesn't impart some left/right motion to the pendulum. Most museum websites and articles about the pendulums don't even mention that there is a motor keeping the thing moving. It's a shame they keep it a semi-secret because the fact that the results could be affected by the motor and magnet is a bit disconcerting to me. What about my other question, how can there be a "fixed point" that doesn't rotate if the building is rotating (plus the magnet/motor giving it a 'push')? What have you heard about that?

[@sissyfus6181]

@@frankdrebin2343 " how can there be a "fixed point" that doesn't rotate if the building is rotating" The fixed point as you call it is in effect a free swivel, a universal joint which allows the pendulum to rotate freely around its fixing point as it swings. You can set the pendulum swinging in any axis you want. You could set the pendulum swinging in a fashion that it would be swinging in a circular pattern. Looking top down at the pendulum, you can set to swing at any point of 360 degrees. If you choose to pull the weight back to 90 degrees, then release it it will initially go to 270 degrees. When it is carefully set to swing in one axis, it remains on that axis. "It's a shame they keep it a semi-secret because the fact that the results could be affected by the motor and magnet is a bit disconcerting to me." Well I kind of agree with you there, albeit for different reasons. At a permanent Foucault display, the pendulum is the star and what happens behind the stage is not seen as being as important. I don't think they are trying to keep it a secret. I'm sure some permanent displays go into details about whatever mechanism is being employed. But I would be very interested to know all about the method of mechanism being used, just from a point of electrical engineering. You might find it interesting that as a teenager, I (with some friends) built a Foucault pendulum. The fun thing was that we built it within a hundred feet of a permanent display pendulum. From our observations on a pendulum built with construction site stuff, we determined our latitude to a fraction of a degree. We were pretty amazed that we replicated results of the permanent display pendulum at a fraction of the cost, built with junk.

[@frankdrebin2343]

@@sissyfus6181 I don't think any museums go into specifics about their exhibits. In fact, they really don't seem to like the questions. It's a show and you aren't supposed to ask about back-stage. Art museums don't like talking about how many of their paintings are replicas and how many of the "marble statues" are actually plaster casts (maybe with a little marble powder added in) - like the statue of David. That is obviously not carved out of one piece of marble but the museum sure wants you thinking that it is. So I would be incredibly surprised if any Foucault exhibit is straightforward about how the mechanism works.

[@divermike8943]

I still can't wrap my head around how the foucault pendulum works when away from the poles. I don't understand the cone shown. Why are you wrapping pt A over to pt B?

[@UnoDisponibileGrazie]

Yeah. This!

[@arandomchannel56]

My head is spinning more than that pendulum I'll go catch a break

[@Lord-Sméagol]

Flat-Earthers will want this video banned as propaganda :)

[@cool.guy.exe404]

Aint no way bro gave earth a party hat

[@BeardedTrump]

I live near the Ukrainian borders and I was wearing my earphones while watching this video at minute 1:58 I thought it was a bomb or a rocket falling from the sky no jokes my heart fell

[@StickScience]

Sorry about that. Hope you stay safe.

[@sandyjamison5929]

❤️

[@hagerty1952]

I remember reading somewhere that Foucault called his original pendulum a "gyroscope" from the Greek "to view the turning." I'm not sure how that name got used for the spinning wheel on an axle, although I'm sure it can be used for this purpose also.

[@den2002ph]

0:31 flatearthers does not even understand from this point

[@MarkAMMarrk]

THANK YOU! I've been wondering for 50 years how this worked "off-axis"! I don't do math but your visuals are perfect!

[@LFTRnow]

GPS (and before that, accurate maps) give you the answer, but it's interesting to consider you could use this to find your latitude anywhere on Earth if you have an accurate clock (and ideally can measure fractional degrees so you don't have to wait over a day to get your answer).

[@ritwikbasak4960]

Here after new Indian parliament installed it :D btw Best Video

[@ujjwal2473]

ah yes😎😎

[@chiricuttcomepapt5100]

I understand why in Quito, where I was born and grew up, I never saw a Foucault Pendulum. At 0 latitude, such a toy would be infinitely boring.

[@ZenriqueFS]

Came here thinking i would understand but now im feeling as dumb as possible.

[@Flame304]

Take that Flat Earthers!

[@954MrSayre]

The false narrative of earth nah u can keep it thx

[@Flame304]

@@954MrSayre then how FE explain Foucault Pendulum?

[@kitcanyon658]

@@954MrSayre LOL. Says the guy who can't math his own magical fairy tale world. How lame, bro. Seriously.

[@rod1575]

He showed no real pendulum. Just bs you fool.

[@ra2186]

@preFire-954- I doubt I'll get an answer since you're all full of shit, but I'll ask anyway. How do you explain snipers hitting long distance targets if the earth isn't round?

[@kellyd6195]

Thank you for putting this together. This is something I can use in my classroom, when I’m covering periodic motion.

[@thewobblywelder8362]

Too incompetent as a teacher to come up with your own way of explaining it? Typical.

[@StickScience]

Glad it was helpful!

[@clcagwin]

No, it isn't. This is insanity!!!

[@AlexeyAstafyev]

where can i see the footage of the foucault pendulum in the southern hemisphere? australia? south america? send a link to the video. really want to see

[@dwayne20110521]

@@clcagwin Navigating with a gyroscope would be impossible if the Earth is turning.

[@Watchdog_McCoy_5.7x28]

So according to this, you can set up 2 or more pendulums side by side, and they should theoretically rotate the same exact way at the same exact speed. Has anyone tried this?

[@kitcanyon658]

Well you probably want to have some way to prevent any airflow between bodies to effect the other.

[@AlexeyAstafyev]

where are the actual videos of Foucault's pendulums swinging? Why are you showing us pictures on the screen?

[@AlexeyAstafyev]

надо попробовать

[@kitcanyon658]

@@AlexeyAstafyev : Are you unable to search KZbin for such videos? There is a icon shaped like a hand held magnifying glass that you can click on and enter text of something you want to find.

[@AlexeyAstafyev]

@@kitcanyon658 please please send me a link to the video of the southern hemisphere puco pendulum. I can't find anywhere.

[@Benjybass]

Good explanation, but it would have been better without the AI voice and piano music in the background.

[@OVAstronomy]

Awesome video! These pendulum are great at showing inertial forces due to us living on an accelerating sphere, the Coriolis force in this case.

[@rap1df1r3]

Makes no sense... First of all, every pendulum in the world uses electromagnets as a way of controlling its rate and speed, so they're only for show, nothing more. But more importantly, if the Earth indeed turned under pendulums, it would also have to turn under everything else that's detached from the surface, which it clearly doesn't do.

[@OVAstronomy]

@@rap1df1r3 you can create your own foucault pendulum to make sure there's no electromagnets and you'll see the same effect due to Earth's rotation 👍 everything that is swinging experiences this effect.

[@dwayne20110521]

@@rap1df1r3 "Navigating with a gyroscope would be impossible if the Earth is turning."

[@rap1df1r3]

@@dwayne20110521Same with a sextant as it proves flatness, which infers it can't be spinning.

[@lucam8758]

​@@rap1df1r3what is there that is detached and stays still for 24h?

[@kresimirbozic1976]

This is amazing, really nice visualization. My head was hurting a bit trying to understand it, this helped a lot. Thanks.

[@StickScience]

Great to hear!

[@davidroosa4561]

math was never my thing, i must admit

[@AlexeyAstafyev]

where are the actual videos of Foucault's pendulums swinging? Why are you showing us pictures on the screen?

[@Kolopsych]

Love the breakdown. Since the experiment suffers from entropy, and requires a little mechanical assistance. Do you have an example of such a mechanism? Does it minimize error, as to not interfere with the demonstration, or is the amount of assistance so little it would be hard to contribute or counter the drift. A flat earther may claim it’s all fake. Otherwise the unassisted swing can prove the precession, but need to sort of keep the experiment in motion. Or knowing the rate of precession, the assistance adjusts as not contribute nor detract from the precession

[@kitcanyon658]

Well. How about repeating the same set up at different latitudes and compare the data. If there is mechanical issues how would you explain ways getting the same result as predicted for the latitude?

[@Kolopsych]

@@kitcanyon658 awesome, of course flerfs are scared of performing Eratosthenes experiment all of the globe at the same time. But I would still love to see the mechanism maintaining the swing

[@kc8rjs599]

@@Kolopsych Just doing one FTFE likes to show where the physicist uses a sandbag, ink and paper with a long rope and burns the holding line from its highest position before the swing goes long enough to see motion over 40 minutes, no mechanism, or magnetic pulse to keep the pendulum swinging just plain and simple to eventualy get an angle from the starting stroke to final stroke.

[@dwayne20110521]

@@Kolopsych In some Foucault pendulums found in museums and public exhibitions, additional mechanisms such as electromagnetic drives or periodic "kicks" are employed to help maintain the pendulum's oscillation. These mechanisms are introduced to counteract the effects of air resistance and other sources of energy loss, ensuring that the pendulum continues to swing at a consistent amplitude. By using electromagnetic drives or periodic "kicks," the pendulum's oscillation can be sustained, allowing visitors to witness the gradual precession effect due to deception of evil men trying to control our world and make us believe there is no God but they are to be trusted. The Foucault pendulum experiment is a fake scientific demonstration not proof but to deceive people into believing the earth is turning.

[@JustWasted3HoursHere]

It's best to not introduce any external forces, like through mechanical assistance, to get an accurate result. In any case, a tall enough pendulum in a draft-free environment would work long enough to prove the point that it precesses as predicted.

[@porpedroiiebertrand]

It even has one at PUCRS in Porto Alegre that takes all 3 floors of the museum (30° S)

[@cskinner0129]

“Some people just want to watch the world turn”

[@darrellkimmel2646]

Really great demonstration, thanks. I do have a question. At any latitude other than 0° or 90° does a Focault pendulum precess at a constant rate? While swinging northsouth there is more Coriolis effect than when swinging eastwest. Does this affect the rate of precession?

[@lightninlad]

I have an even BETTER question-how do you know that the universe isn’t rotating and exerting a centrifugal and Coriolis effect which causes the pendulum to rotate while the earth itself remains fixed? Answer: There is no way to know if that is what is really happening. That’s why Einstein wrote: ”…to the question whether or not the motion of the Earth in space can be made perceptible in terrestrial experiments. We have already remarked that all attempts of this nature led to a negative result.” Source: * Relativity - The Special and General Theory (1916), Part I: The Special Theory of Relativity, Experience and the Special Theory of Relativity

[@alexandreaudette6591]

​@@lightninlad Using classical mechanics, you can predict the precession rate of the pendulum at any latitude. Measuring the precession rate at a few latitudes would be enough to find the rate of rotation of the Earth and showing that it is also round (spoiler alert: this can be done and will verify the predictions). Hence, even if any centrifugal force was applied on the Earth from rotation of a larger ensemble, this has a much smaller (insisting on the "much" here) effect on a pendulum on Earth than Earth's rotation. Also, the quote you used from Einstein is (1) not complete and (2) incorrect. (1) Einstein finished this quote with: "though the Earth is revolving around the Sun." (2) Just before where you start your quote, Einstein was writing about the Michelson's inferometer, an optical instrument. You quoted Einstein as saying "terrestrial experiments" when in fact, Einstein used the word "optical", referring to the inferometer and other optical experiments.

[@lightninlad]

@@alexandreaudette6591 Yes, Einstein was making an assumption based on NO EVIDENCE. I know he ended the quote that way. That’s why it’s so bizarre. He just got done insisting that the earth rotates around the Sun but he neglected to give any proof for that. Additionally, no-Einstein knew that all of the observations regarding the pendulum would be exactly the same if the earth wasn’t moving. You would get the exact same measurements. That’s what relativity means. The pendulum IS a terrestrial experiment. It proves nothing.

[@jlowe8059]

@@lightninladNone of what you said is either accurate or sensible. Congratulations.

[@OudeicratAnnachrista]

@@lightninlad rotation is detectable just fine, einstein wasn't talking about rotation, he was talking about the earth's orbit around the sun. Orbits aren't locally detectable without some external reference because they're just freefall

[@A15degreeperhourdrift]

Thanks Bob.

[@StickScience]

Glad it helped!

[@sphaera2520]

@@StickScience in case you don’t frequent the globe-flat earth community, op was making a reference to bob knodel. The man who measured earth’s rotation of 15°/hr with a borrowed $20,000 laser ring gyro, but hid the results from his flat earth buddies until he came up with an “appropriate” excuse. Fortunately for everyone he blabbed on himself when the documentary crew for a certain Netflix documentary came along. Smh.

[@A15degreeperhourdrift]

@@sphaera2520 _"Interesting"_ ..............................

[@Mr4thetruth]

Great video, so well explained.

[@AlexeyAstafyev]

where are the actual videos of Foucault's pendulums swinging? Why are you showing us pictures on the screen?

[@howieduin915]

I saw one of these at the Boston Science Museum when I was about 8. Was fascinated by it. The pendulum was very close to one of the standing dowels. I had to watch til the pendulum knocked it over, much to the irritation of the teacher. I didn't quite understand it. Apparently the teacher didn't get it either. Her explanation was nonsense. Glad you cleared it up for me... 60 yrs later.

[@Betterdayz2012]

If this is so, shouldn't the wire get twisted?

[@velvethamster9809]

The top has a ball bearing that is not directly connected to earth.

[@IASON.]

If the building is anchor to earth, the ceiling anchor to building, pendulum anchor to ceiling, everything is anchor together and rotate together. How does this make sense??

[@teslapower3646]

Say, if you could attach a pendulum to a drone/helicopter, the same effect will still take place. This is because of the coriolis effect and the point of the experiment was to prove that the earth is rotating. A flat earth would not be able to achieve this same effect. The second point instinctly proves that it's not a flat earth because the location of the pendulum on the sphere would show different effects it would have at different latitudes. This is no different in trying to explain how a stationary helicopter "moves" with the earth's rotation? Same argument when people say an airborne object like a helicopter staying stationary should see the ground move underneath it but it doesn't. The "stationary" helicopter drifts with the air mass caused by coriolis. If that wasn't the case, we would be exposed to winds up to 1000km/hr as the earth rotates beneath the "still" air above. But that doesn't happen does it? So, the air is mostly moving with the earth's rotation and airborne objects move with it. Hence why aircraft/birds need power to move against it to get from one place to another horizontally. Otherwise, it would be virtually free travel. Just jump up in the air for a while, hover for a bit and land in a different spot at a later time. But no one's been able to do that have they?

[@AndreasEUR]

What you just said makes absolutely no sense.

[@mikefochtman7164]

When the building rotates (with the earth), the pendulum simply rotates around it's vertical axis. That is, 'it spins in place on the wire''. But that motion is not side to side like the 'swinging' motion. Imagine you took a marker and marked just one side of the 'bob' so that it faces the front door of the building. Then set the pendulum swinging. The 'marked' side will always face the door. But at some points during the day it will be swinging to/ away from the front door, and other times it will swing side-to-side across the doorway. But the mark will still face the door all day/night.

[@AndreasEUR]

@@mikefochtman7164 nope, that's false. The pendulum doesn't rotate, everything around it does. The pendulum is maintaining it's relative position in 3d space.

[@mikefochtman7164]

@@AndreasEUR Try again. I was talking about a different motion from the 'swinging'. If you think of the suspension wire, clearly the top of the wire is fixed to the building. And the 'bob' is solidly fixed to the wire. If the 'bob' didn't keep the same side facing the front door, the wire would get twisted around and around until it broke. Maybe the word I should have used is 'revolves', to separate the motion I'm describing, separate from the plane of the 'swinging'. Simply get a pen and put a mark on one side of the bob and notice that it's always facing the same side of the building as it swings all day. As the plane of the swinging appears to rotate around, knocking down the little pegs, the marked side of the pendulum is still facing the same side of the building. So we can say that the plane of the 'swinging' is fixed in 3D inertial space and the planet moves under it. BUT, the bob 'revolves' at the end of the wire with the building, facing the same side of the building as the building rotates around the earth. Two different motions.

[@Jarektv2]

As we all know the foucault pendulum is a victorian parler trick powered by magnets, anyone claiming they can do it I want it filmed from top to bottom for 24 hrs no cuts and most definitely no magnets.

[@sH-ed5yf]

No it is not. and you can perform it yourself easy

[@AlexeyAstafyev]

where are the actual videos of Foucault's pendulums swinging? Why are you showing us pictures on the screen?

[@Jarektv2]

@@AlexeyAstafyev Because he doesn't have proof, the ones in a museum are powered by magnets. If he really wanted to prove something he would provide the video 24 hour timelapse, no cuts in the video and no magnets. but he can't do it

[@AlexeyAstafyev]

@jarekt_v2 👍Yes

[@sH-ed5yf]

@@Jarektv2 so you have no proof for thst wild clsi. Whatsoever. Just do it yourself at home 😅

[@clcagwin]

Cone earth confirmed lol

[@christophep3012]

Thank you. Really the cleverest explanation I have seen in twenty years. Thank you for not talking about Force because there are none in this process. Unfortunately it doesn't clear up everyhing. Considering Foucault point of view or experiment, the axe of the cone should perpendicular to the zenith of the place it is experimented not the north pole.

[@speed_demon420]

Ahhhh, the old magnets

[@C_Becker]

Which magnets?

[@fredcaldwell9824]

Are we to assume Foucault's pendulum "leaves earth's rotation" as it swings? Sure sounds like it. And if that's the case, a jet going 500 mph at the North Pole heading south would take 12 hours to reach Malabo, Africa along the equator. However, the ground below the plane would be traveling 1038 mph eastward, playing havoc with landing on a N/S runway. And, Malabo 12 hours after takeoff would be on the opposite side of a spinning ball earth.

[@entangledmindcells9359]

You are forgetting the key ingredient to flying.. air speed. Planes are constantly adjusting plane direction to account for air speed especially cross wind.

[@TheWokeFlatEarthTruth]

Hi fred, hope that you are well. "the ground below the plane would be traveling 1038 mph eastward,"...not with respect to the airplane it won't. The aircraft was rotating with the Earth before it took off, this means that it has angular momentum. It does not magically lose this angular momentum when it takes to the air. It is still rotating with the Earth when it is in the air due to this angular momentum. Take care.

[@Jasoninee]

Yea you are completely ignoring the air. A plane flies through the air. So sure, relative to being an outside observer the plane on the equator like you mention is going fast as eff, but both the earth and its atmosphere are essentially locked into the same speed. You may as well be upset that a person can swim "faster" than humanly possible down a river.

[@chrisantoniou4366]

Watch the video again until you understand!

[@davidbowerman6433]

You forgot the laws of motion. An object in motion STAYS in motion unless acted on. The plane ALREADY was moving 1,000mph with the earth on takeoff. And same applies to the fluid the plane travels through. Yes, I said fluid. Air mathematically is just like a fluid

[@MarkSmith-jo2bf]

This proves its round how ?

[@entangledmindcells9359]

lets see. rate of precession predicted to be is caused by rotation the rotation of the earth and the latitude of the pendulum. NO OTHER explanation can be attributed to explain the rate of precession.

[@MarkSmith-jo2bf]

@@entangledmindcells9359 but this application can be applied be it flat or round , it doesn't matter , in fact I'm not even a flat earthier but it would make more sense on a flat version than round

[@entangledmindcells9359]

@@MarkSmith-jo2bf A flat earth motionless earth has no explanation for the rate and direction of precession? Why would the rate of precession be at the max the poles, 0 at the equator and the direction is opposite on the two sides of the Equator. A spinning Globe predicts this

[@MarkSmith-jo2bf]

@@entangledmindcells9359 who on earth though that if the earth was flat it was motionless 🤣😂 utterly ridiculous notion. If the earth was to be flat it would be rotating , and a pole on the outer and north pole on the inner would make more sense on a pendulum that being round , as on round the north is above and south is below , this would bring a pendulum to a standstill , unless its a machine driven pendulum in that case none of it would make sense

[@entangledmindcells9359]

@@MarkSmith-jo2bf "I'm not even a flat earthie" and you just parrotted a bunch of FE garbage.. Have fun trolling someone else.

[@Thevwsheldon]

Ever seen a wrecking ball? Well I have watched them many times and they never act like a Foucault pendulum is supposed to and the bigger one is the better it would work so just watch a parked Crane with a wrecking ball and you will wonder why don't it do like the Foucault pendulum and the answer is because they use magnets and electricity in a Foucault pendulum, and I even did some extra research and they admitted to using electricity and magnetism

[@jobdoneinc.4762]

you don't usually observe a wrecking ball swinging for extended periods of time in the same place. as to the electricity and magnetism, they HAVE to use it in order for the pendulum to keep swinging, otherwise it would slow down and eventually stop and in exhibition pendulums in museums you don't want that. also, using electromagnetism you can add energy to the pendulum not changing its direction. if you want to see a Foucault pendulum without any of these systems, there has been plenty of these also done, including experiments by people on youtube.

[@Mr4thetruth]

Wrecking ball is joined at a fixed point, Foucault's Pendulum is not, it hangs from a point which is able to move. That's what was the genius of Léon Foucault's discovery.

[@AndreasEUR]

They do not use electricity and magnetism. Look at the gentleman physicist video. Zero magnetism. But tmthe pendulum works. Sorry, you are wrong.

[@gowdsake7103]

@@AndreasEUR Neither did Foulcart idiot

[@AndreasEUR]

@@gowdsake7103 ? I never claimed he did??

[@Lazara08]

nice video!

[@liftingtheveil8361]

So how does that work when it is supposedly rotating with earth? It is easy to see that the earth is level and stationary and that it is the sun that is moving by taking an individual photo of sun spots each hour from "sunrise to sunset". Unless earth goes backwards and forwards then stops it's not rotating.

[@sissyfus6181]

This is about Foucault's pendulum. Take your spots elsewhere.

[@stuartgray5877]

we measure earth rotation using fiber-optic gyros tens of thousands of times a day worldwide as the pre-flight test of modern aircraft.

[@liftingtheveil8361]

@@stuartgray5877 A gyro that only works on a flat plane? I suggest you take some footage of sun spots over the course of the day to see for yourself that unless earth goes backwards and forwards then stops hours before the sun "sets", it's not a rotating sphere.

[@stuartgray5877]

@@liftingtheveil8361 - "I suggest you take some footage of sun spots over the course of the day to see for yourself that unless earth goes backwards and forwards then stops hours before the sun "sets", it's not a rotating sphere." And I suggest YOU at least complete HIGH SCHOOL: before calling all Engineers and Physicists to have ever lived a bunch of idiots. For example, what about all of the Aerospace Engineers that build and launch Satellites and deep space science probes for a living?? Are ALL of them being fooled and are really building FAKE satellites but don't realize it? What about the scientists that build satellites that study the sun directly? Are they IN ON the hoax or all too stupid to realize they are being fooled. All while YOU figured it out? Yeah, that seems reasonable. Tell us you graduated high school as a start.

[@stuartgray5877]

@@liftingtheveil8361 - "A gyro that only works on a flat plane?" No, they work everywhere including deep space. We have tested them there. Now ANSWER THER QUESTION HOW do we perform a measurement tens of thousands of times a day EVERYDAY that says the earth is a rotating sphere?? Are ALL of those gyros "Lying"? Because what I say IS a "FACT". I have been performing this measurement as part of my JOB of the last ~30 years which I SUSPECT is longer than you have been alive. EXAPLIN this fact or admit you cannot.

[@zhangwei4622]

This is too confusing. I'm just going to accept what flat earthers and the Bible tells me without question.

[@TB-xx8vj]

So the claim is that the earth drifts (turns) underneath the pendulum. If that is true then the earth must also drift (turn) underneath other objects in the air including drones, helicopters, and airplanes. We don't have hovering drones or helicopters with destinations coming to them. Flights from Charlotte NC to Los Angeles CA don't take an hour and a half. Foccault's pendulum does not prove earth turns. Your argument is not logically consistent.

[@AlexandrePRODHOMME]

The plane doesn't hang quasi frictionless above the ground. It as angular momentum from take off and surrounding massive air mass. Foucault pendulum does prove earth turns because it starts from a high point motionless. If you jump inside a train in movement at 300km/h you won't get smashed at the back of the carriage, because you have the same angular momentum, you are part of its referential. But if you jump from a platform onto a train at that speed, you are turned into Human Parmesan.

[@TB-xx8vj]

@@AlexandrePRODHOMME The airplane is not attached to the ground, it is in the air. Air doesn't have any bonds and moves freely in all directions, not tethered to the ground. Your argument is that earth drifts (turns) underneath a pendulum, so then it must also turn underneath other objects in the air not attached to the ground. It doesn't, so therefore your argument is not logically consistent.

[@AlexandrePRODHOMME]

​@@TB-xx8vj You chose to ignore the demonstration right after I made. Listen, I didn't make it much further than high school physics but I still remember it and you can read it too online. Conservation of momentum, and the importance of angular momentum. How did the plane get in the air? It took off. Therefore it's referential is Earth+Atmosphere. If two planes were flying side by side and you walk from one wing, you could potentially jump to the other wing (given you are not too high, too fast etc obvs, just an example) but it is true as that's how airjet refuel. They reach same velocity they are therefore in synchronous speed. The pipe dangling from the jet to attach the other plane does not hit the other jet at 1000km/h. Relative to the other plane, it's almost static. Being attached to the ground or not has NOTHING to do with relative speed. Angular momentum is everything in the case of plane since when the plane take off it takes the momentum of the earth. At no point it can remove itself form it. That's high school physics, it's Newton's laws. Also you are mistaking of measurement of rotation and moving at speed. The pendulum only measure rotation. Just rotation. First, the pendulum suffer of minor bias from the moment of the throw, but the way it is attached at the top makes it a low friction hang, pulled by gravity. It is part of the earth referential and the dome so no, you won't see it fly out of the wall. The only (or greater) forces are gravity pulling it down and the initial push on a plan of swing, therefore yes, it continues to swing on that plane and as the swing continue, the ballhead attachment at the top is the one rotating to keep track of the tremendous force of the swing and gravity pull down, as the dome continue to rotate with the earth.

[@TB-xx8vj]

@@AlexandrePRODHOMME You are making a begging the question fallacy. You're starting off with earth moving by claiming there's a conservation of momentum. You're no longer proving earth is turning but just assuming it. This is a classic example of circular reasoning. An argument that uses fallacy is invalid. And as I stated, the air is not tethered to the ground and objects in the air would have the ground also drift (turn) underneath them if earth turned. It was your claim that earth drifts (turns) underneath a pendulum. If true it must also drift (turn) underneath other objects in the air. It doesn't.

[@Beyondthecutworldwide]

@@TB-xx8vj The pendulum only measure one force, the earth rotation. It's not a fallacy, you make an hypothesis, and then make assumption on what the observations should be, and then devise an experiment which proves, or disprove the theory. In the other end you are only offering negation based on your sensorial approach to your surrounding which is the most prone to BS, but offer no explanation for other phenomenon. You can't explain the behavior of the pendulum. Which, when he was designed wasn't even trying to prove the earth rotate, we knew that then, just that it's measurement could be made here, at small scale, even with closed door without seeing the sky. Which it does. Which you can't offer an experiment nor a mathematical model to precisely describe it. Until you can do this two things, everything else is blah blah blah

[@rod1575]

All talk and no real pendulum. Anyone can put a few graphics together and call it a pendulum. The sheep will believe anything.

[@jasonmack760]

There are real pendulums you can see all over the world that demonstrate this or, if you'd like to save on gas, go out to the garage and build one yourself. If you want a visual to go along with it, use a piece of string and a paint bucket full of paint, with a hole in the bottom for said paint to dribble out of. Spin the pendulum in a loose oval and watch the magic. I recommend having a piece of wood or canvas underneath to capture it, it makes fascinating art.

[@sissyfus6181]

@@jasonmack760 He can't find his way out of mum's basement.

[@TheWokeFlatEarthTruth]

Hi j, hope that you are well. Here is a list of many (but not all) the Foucault Pendula around the globe. You can go and visit them yourself. Take care. en.wikipedia.org/wiki/List_of_Foucault_pendulums

[@AlexeyAstafyev]

where are the actual videos of Foucault's pendulums swinging? Why are you showing us pictures on the screen?

[@gregoberski5897]

@@AlexeyAstafyev You're an adult. You can find the videos by searching for them. In this video he is explaining the math and the concept.

[@raysearch-iu3fr]

Actually, it DOESN'T prove that the Earth is a rotating sphere! All it proves is that the rest of the universe is rotating relative to the sphere of the Earth. Which is "fixed" and which is "moving" is entirely relative. This was first explained by physicist Ernst Mach who proved that our world was not only visually relative, but dynamically relative as well; a rotating universe would cause the pendulum to behave the EXACT same way over a fixed Earth. This was later confirmed by Albert Einstein.

[@peterbogardus1560]

Airlines know the world is round; there is no other way to make the distances add up correctly between distant cities, let alone the prices. If the earth were actually flat would the north pole be the center, or the south pole? As pointed out before, they are each circled by separate constellations- and what of the equator? The fact that the math correctly predicts the different relative rotation over a fixed point at multiple locations demonstrates the validity of the spherical explanation, even if one does not understand the details or math.

[@Fuh-Qu]

Earth is flat

[@Chicken_Little_Syndrome]

Earth is fat and motionless. It is not flat.

[@ThatBoomerDude56]

@@Chicken_Little_Syndrome Earth is obviously not motionless.

[@abdulazizz3905]

False misguiding information

[@moggpiano8043]

Grow up.

[@kitcanyon658]

If you're not smart enough to understand the physics then stick to flipping burgers.

[@303alvaro]

well, no, we have a foucault pendulum in our city ;)

[@stevenstice6683]

So disprove it. Where are your sources?

[@gregsiska8599]

To every denier, like yourself, false information is simply information you don't like. It's validity is not relevent to the likes of you.

[@zeushelios-xb7cl]

The earth is flat 😌

[@Ranger6160]

😂

[@christophercharles3583]

Your brainwaves are flat

[@spacelemur7955]

I would have like the trace of the pendulum drawn on a rotating Earth. I didn't quite get the necessity of the cone.

[@clcagwin]

Pseudoscience smh

[@kitcanyon658]

You mean like magical domes and ice walls?

[@gowdsake7103]

Its called REALITY sorry about that

[@ruledbysaturn]

Great effort in controlling the damage. This video explains nothing.

[@leftpastsaturn67]

Not to you it didn't.

[@gowdsake7103]

Wow your THAT dim ?

[@chrisantoniou4366]

The video explained everything, but you understood nothing... There's a difference!

[@ruledbysaturn]

​@@chrisantoniou4366 Presume much? Obviously you do.

[@ruledbysaturn]

​@@chrisantoniou4366 Hey dude or mamn, if you can't touch it or measure it? You are now speculating. Is that what your entire identity is built.on? That's so sad.

[@ncooper8438]

Good, but why play background music?

[@saucerset12]

So if I tried this in my current location of Hawaii, I may never see a full rotation.

[@sissyfus6181]

It would take roughly 68.5 hours depending where you are exactly.

[@Nitephall]

But have do you keep the pendulum swinging?

[@sissyfus6181]

You don't need to keep the pendulum swinging. The length of time that it swings is determined by the length of the rope and the mass of the bob.

[@uncopino]

@@sissyfus6181first, it only depends on the length, not the mass. second you didn’t answer her question.

[@uncopino]

if you manage to keep the friction very low compared to the weight, it’ll swing for days. the ones in museums have compensation mechanisms to give energy to the system at the same rate that friction is eating it up. these mechanisms are designed to not interfere with the trajectory of the pendulum though

[@sissyfus6181]

@@uncopino "first, it only depends on the length, not the mass. " The period of the pendulum is determined by the length. But mass is the major determinant of how long the pendulum will keep swinging. More mass, more momentum, so the effect of air resistance is minimized. (and other forces). All Foucault pendulums have a rather massive bob.

[@reedr7142]

I don’t know why I like the background piano music so much.

[@mckenzieauclair9067]

This makes sense if your in the North Pole but i still don’t see how if you’re on the side of the earth or near the equator how the ground would do a complete circle if the earth would only be spinning East.

[@Hugh.Manatee]

From the way you phrased that, you were already really close to understanding why. Think about someone floating above a fixed point on the equator. The Earth's spin takes you directly east, so the floor doesn't appear to rotate under them. On the poles you are aligned with the Earth's axis of rotation so the floor rotates below them once every 24 hours. Now walk 100 meters (or a 100 yards) away from the pole and turn east. If you start walking east and want to keep walking east, you have to turn to make a circle with a radius of 100 meters. If instead you'd turn eastward at your initial point 100 meters from the pole and just kept walking straight you'd go to the equator, further south to a point 100 meters from the other pole and then back to your initial spot. Unless you're on the equator, east is not a straight line. The direction of east rotates as the Earth moves, so the pendulum rotates (or from the perspective of the pendulum, the Earth rotates underneath it).

[@tomcass240]

@@Hugh.Manatee This explanation is so much better than this terrible video. Glad I read the comments.

[@mmeyer795]

Every single Flerf can do this experiment on their own, the only problem is every one of the mouth breathers flunked out of school and don’t even understand most of these words this guy is speaking, let alone do math themselves. Lol. 😂

[@saigonmonopoly1105]

earth rotate south east \ up diagonal north west ?

[@AKASHSHUKLA-tp5qq]

But how does a pendulum keep on swinging amidst the atmospheric drag?

[@sissyfus6181]

Some do and some don't. Keeping on swinging is not the point of the pendulum. The fact that they precess as a function of latitude is the point.

[@colorfulfamily]

There were a lot of messages in this post

[@chozen0018]

Jave they done thos test with a plastic pendulum ? To advoid magnetism

[@sissyfus6181]

The pendulum is purposely built of non magnetic metals. Some have even been a bucket of concrete.

[@BronzeDragon133]

Most are lead; diamagnetic material (or non-magnetic) (lead is a very cheap way of packing a lot of mass into a small space). Plastic's density is very small.

[@MarcVinal]

In layman turns pls? Stafe Marc xxx

[@AJxxxxxxxx]

*_using celestial navigation and trigonometry you could mathematically prove that earth is a globe_*

[@messemphanger]

But the string that the pendulum is attached to is also attached to mounting point which is attached to earth, They are all spinning together.

[@sissyfus6181]

That attachment point is a universal joint low friction type of pivot. The pendulum is free to swing in any direction.

[@xlfc]

SERIOUS QUESTION! Can someone explain me, how come, that the hinge that the pendulum hangs from doesn't spin with the earth? I thought, that according to inhertia sysytem it should.

[@paulrandig]

It is a ball joint. And let's assume that it is frictionless. So any spinning of the fixed part of the joint would not affect the pendulum.

[@stephenfortin9485]

its a near frictionless joing / hinge

[@sheikGR]

But the pendulum is hanging not from some imaginary stationary point in space but from a ceiling from example that itself rotates with the earth. Doesn't this change things? I'm so lost

[@sissyfus6181]

It's a kind of universal joint that allows it to swing in any direction unimpeded.

[@chozen0018]

How do you know its not magnetism effective it ?

[@sissyfus6181]

Because the pendulums are not of a magnetic metal. Look into it.

[@terri6854]

But isn't the thing the pendulum is attached to also moving along with the floor? Or is the pendulum attached to outer space?

[@Caaro99]

it doesn't matter if the pendulum is attached to the moving floor. You can test this out your self, place a pendulum on a spinning table and place a camera on the table. The pendulum will seem to move in circles from the perspective of the camera.

[@ItsMeScareCro]

@@Caaro99 - Laughs in cranes all over the Earth that aren't spinning wildly out of control.

[@kitcanyon658]

@@ItsMeScareCro : Says the guy who doesn't even understand whole point of this video. Another classic flatter fail. Sucks to be ignorant, son. Get a real education.

[@ImieNazwiskoOK]

@@ItsMeScareCro Ah, the whopping speed of 1 rotation per 24 hours

[@ItsMeScareCro]

@@ImieNazwiskoOK - at over 1,000 mph... Ready to purchase that beach front property in Oklahoma?

[@grapeshott]

Is it just coriolis force?

[@Hugh.Manatee]

No, but they are related. Both the Coriolis effect and the precession of Foucault's pendulum are caused by preservation of angular momentum. The Coriolis effect is the apparent curvature of an object moving freely in a rotating reference frame. The pendulum remains in the same spot (at least it's centre of oscillation does).

[@Wilett614]

There is a Pendulum as described in this video at the "Franklin Institute" in Philadelphia Pa. I've seen it swinging as described many times ... : )

[@unknownkiller530]

2 minutes in and I remember why I hated school.

[@shirfree]

why does the initial reference frame not work for the pendulum?

[@rocketman484]

I believe you mean "Inertial"

[@shirfree]

@@rocketman484 do you know?

[@stuartgray5877]

@@shirfree Because existing on the surface of the earth is NOT an "Inertial Reference Frame". You are under the acceleration of gravity.

[@shirfree]

@@stuartgray5877 you are spinning with the earth though, so relative to the earth you are not spinning

[@stuartgray5877]

@@shirfree Sure. So that IS a "rotating reference frame" and if you are using coordinates within that frame then your coordinates do not indicate any type of spin.

[@familyguy1182]

So many questions. But im gonna to ask one only: how this pendulum is not effected by gravity?

[@kitcanyon658]

It is. That's why it swings towards the ground.

[@electricdynomitegamer3988]

Humans a thousand years ago were never exposed to the exhaust from leaded gasoline. This is why I think they were so much more smarter-er-er than we are now.

[@stuartgray5877]

The movie "idiocracy" was a documentary sent from the future to warn us. The last election was proof we are not paying attention.

[@thegymsamaritankerr573]

Where did the pendulum come from

[@geirmyrvagnes8718]

Paris.

[@davidroosa4561]

there was one at the museum of natural history in Washington, i saw it in 1973, had no idea what it was for. turns out they removed it in 1998

[@utkarshshukla6238]

Excellent

[@MiaStayingCreative]

This should be easy enough for your average person to model and home and understand, but it’s not. If this theory works with a large pendulum, why wouldn’t it work with a smaller one? Like if I hung a small pendulum from my ceiling wall, why wouldn’t I get same effect?

[@kitcanyon658]

Which is it, a ceiling or a wall?

[@stuartgray5877]

A small pendulum does not swing for long enough to detect the effect. The longer the cable and the heavier the mass, the longer it will swing.

[@zx3215]

Wow, didn't know FP's spinning period depends on longitude.

[@JustWasted3HoursHere]

Latitude, but yes.

[@zx3215]

@@JustWasted3HoursHere oops, my bad :)) I keep confusing these two all the time.

[@JustWasted3HoursHere]

@@zx3215I used to do the same. They should have named them something easier to remember, like "side-ittude" for longitude and "updown-itude" for latitude. :)

[@zx3215]

@@JustWasted3HoursHere 🤣 yes, this would solve a whole lot of problems :))

[@JustWasted3HoursHere]

@@zx3215The way I used to remember them is that "latitude" sounds like "ladder-tude" and you use a ladder to go up and down; and "longitude" made me think of Pinoccio's long nose, which extends out from his face (rather than up or down). It's silly but it used to work for me when I was a kid.

[@jacob4259]

you know what is the average response in the comments "i cant do the math/dont understand the math” super cool now we know why there is sooooo many fe

[@dwayne20110521]

Can you help people to understand, "Navigating with a gyroscope would be impossible if the Earth is turning." There is evil and it wants you to believe there is no God. A gyroscope is a device that maintains its spin axis direction regardless of the orientation of the outer frame, regardless of the G-force, in space, not to Earth. It is used in various applications such as inertial navigation systems, compasses, automatic pilots on ships and aircraft, in the steering mechanisms of torpedoes, and in the inertial guidance systems installed in space launch vehicles, ballistic missiles, and orbiting satellites.2 Gyroscopes are also used in gyrotheodolites to maintain direction in tunnel mining. should be able to see 1 degree ever 4 min

[@mharouny1]

1:40 claim needs explanation. You threw that out there like it was self-evident.

[@sissyfus6181]

Yeah, that is not very self evident and could be better explained.