Which Way Will the Water Go? (ft. Steve Mould)- Smarter Every Day 226

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Destin

[@TheTepeproductions]

Steve is a really smart guy if you ignore the British accent" **angry tea clink noises**

[@FRN2013]

My dad, who was a very proud Englishman, would have dropped the teapot onto the crumpets

[@TheTepeproductions]

@@FRN2013 as a proud English man, I threw my tea set in a fit of rage

[@perolozac01]

I would think an englishman would just "humpf" it off and keep composure. :)

[@TheTepeproductions]

@@perolozac01 not when our honor is on the line, we must stand strong and show no mercy, even if we take casualty in the Shape of crumpets and precious tea, we will continue this war until it is over and we have served the crown with due justice

[@stephenbenner4353]

I think Destin is speaking tongue in cheek to mock himself as given the average perception in the English speaking world people think a British accent sounds smarter and an Alabama accent sounds dumber.

[@tracechaffin1792]

The British version of saying “I disagree and you’re wrong” is “that’s interesting” 😂

[@DeltaDS]

thats the truest thing ive ever heard

[@MouseGoat]

well, it is interesting, when you disagree with somone who are clearly wrong 😂

[@brent4adv]

The southern American version of this is, "Bless your heart".

[@antoniog9814]

It's not really the British way, only the English. My Scottish wife doesn't use "that's interesting" with me.

[@jamesmcginn6291]

@@DeltaDS That's interesting.

[@theCodyReeder]

Ok now I want to know if this will do the same with lasers instead of streams of water. I assume a much greater rotation rate will be required.

[@foamboard_shenanigans]

Can you hire the LHC by the hour and give that a try?

[@rompdude]

I would expect so, but I think you are right about the speed being key. I suspect a very fast rotation before you can really see a "bend". The water molecules move extremely slow in comparison to light, so it's very easy for the rotation to overcome this. Also.. Absolutely love your channels, I hope you can keep doing what you do as long as you feel you can.

[@TheSpacecraftX]

The ol relativistic sprinkler.

[@duroxkilo]

@Cody'sLab that was a great thought. the speed of light remains constant but the frequency would change (relativistic doppler effect).. i'm guessing that adding the two vectors as in this video (speed of light + rotation speed) would produce a perceived change in the color of the laser. depending on the observer's position i imagine it could get trippy..

[@MediocreHexPeddler]

I think that whatever apparatus you constructed to hold the laser emitters while rotating would overcome the tensile strength of its material before you could observe a perceptible curvature of said lasers... unless you did so on an enormous scale. If you put a field of light-scattering dust around the planet and recorded the laser light interacting with that at a fraction of a light-second's distance from the emitter, it could be done. Very close to the emitter, you would notice nothing, but in low orbit, you'd notice a slight bending, and in geostationary orbit, you'd have about 120 milliseconds between the emitter and the observed scattering. You would need extraordinarily sensitive imaging equipment to observe such an effect, and the farther the laser traveled through such a cloud, the more it would scatter and the less perceptible it would become.

[@michaelgoddard1435]

9:08 starts the most important 1 minute and 10 seconds of SmarterEveryDay humanity life lesson. I share this with my students every year so they get to hear it at least 3 times and hopefully we ingrain a life skill about perspective, rational thinking, humility, and empathy. I give Dustin a standing ovation on this one!

[@bobhoffer5426]

you said it better than I could...bravo!

[@InsideInterpreting]

Destin

[@nottiification]

"When i disagree with someone it is imperative that i stop, i listen and i don't move on until i completely understand the other persons perspective. Because its possible you'll find that you don't actually disagree" How to achieve world piece in a nutshell.

[@jaimes.limasb.9913]

And once we've got all the pieces, we'll finally build peace lol.

[@andrewsackville-west1609]

@@jaimes.limasb.9913 Whirled peas.

[@harshsomvanshi8963]

No no the world in pieces is the opposite of what we're going for

[@hamnchee]

Or, after stopping to fully understand the other person's perspective, you find that in fact you fundamentally and irreconcilably disagree, and one of you must die.

[@Antanies]

I feel that this applies to 90% of politics.

[@knightriderultimate]

Destin: *is a rocket engineer* Also Destin: "Sidewards Velocity"

[@shadowprince4482]

Well he's also from Alabama...

[@AndrewFRC135]

If your rocket has "sidewards velocity", something has probably gone wrong.

[@markoftheland3115]

Exactly, rocket engineers don't learn sidewards velocity, imagine rockets going that direction

[@the_potatoborn]

@@AndrewFRC135 you don't know much about rockets, do you? If your rocket DOESN'T have tangential velocity, you're doing something wrong.

[@AndrewFRC135]

@@the_potatoborn On the contrary; tangential velocity relative to Earth is of course needed to achieve orbit. Velocity perpendicular to the orientation of the rocket itself, however, not so much.

[@johanung]

“When I disagree with someone, it is imperative that I stop, I listen, and I don’t move on until I completely understand the other person’s perspective.” The experiment was awesome, but this profound insight at the end really hit home. If anyone ever asks me what it means “to have character”, I think I’ll link them this video.

[@stabileseitenlage1807]

totaly agree

[@nicholasrhine3191]

Right on.

[@BretGregory]

I really appreciate this quote right now - I wish our president would too.

[@Kenjiro5775]

Well said on both counts. About being wrong and about having character.

[@Kenjiro5775]

@@FlightChops I'm an engineer too and it is easy to fall for the trap of thinking you are the smartest person in the room. What helped me greatly is to use honest, self deprecating humor. Such as, "I'm just a dumb enginerd, but should we try...", when speaking with technicians who often have more practical experience than I do. Also, watching people QA parts I have designed humbled me in how troublesome a careless callout selection in drawing software can be. Humility is a must for engineers. 👍

[@randanman]

I like how you both don't care about who was wrong, its about discovery and learning.

[@ambreeshkhurana1115]

He turned an already awesome video to another level by his monologue at the end. Even I was thinking the same thing during the video that Destin is not listening to him properly. But it was cool of him to accept that in the end. Loved the video and your channel in general too.

[@LikeOnATree]

Destin, your quote at 10:00 really resonated with me: "When I disagree with someone, or at least I think I disagree with someone, it is imperative that I stop -- I listen, and I don’t move on until I completely understand the other person’s perspective. Because it’s possible, you’ll find, you don’t actually disagree." A great takeaway and a great quote for all of us! Thanks so much for being real and explaining how you felt! Yet another great video, well done!

[@christianbarnay2499]

This is the basics of communication and it is always worth reminding from time to time. All communication comes with a whole bunch of implicit things like vocabulary, point of view, historical info, know-how, etc that are considered common knowledge and left untold for the sake of efficiency. It takes a lot of effort to second check them and make sure they are really common. So unless you have absolute certainty that the other party is a complete moron and is not worth talking to (then why are you talking to them in the first place?), you should always consider that this person is not stupid. So when what they say doesn't make sense to you, your first reaction should be to trace back their arguments and try to find out at what point their reasoning differs from yours. Then it's relatively easy to explicitly tell them so you can review what was truly agreed on and who is right or whether both views are just different wordings of the same thing.

[@Rygir]

Seeing how often we get the basics wrong I'm happy to have a video where it's shown and handled well. I think this video is the first or at least the best example where I see someone realizing it. And on top of that he doesn't weasel out but he makes it a great lesson!

[@MichaelD-fn5lv]

Destin: "I thought I was wrong, but it turns out I was mistaken."

[@default632]

Lmao

[@lelenovo6296]

AvE?

[@willmpet]

A woman I knew was always right, she had a thing on her desk that said "I thought I was wrong, but I was only mistaken." I never understood it till now!

[@sebastianelytron8450]

omg😂

[@MichaelD-fn5lv]

@@lelenovo6296 ding ding diiinng!!! Hahaha!

[@drandana3661]

You're a great roll model and your genuine conversation about vulnerable scientific conversation is spot on!

[@H3r404]

Gosh, I love your channel! It's so fun to watch someone be enthusiastic about stuff! I really appreciate how you stop and address stuff like how you guys were agreeing but not. I appreciate your outlook on life and that you choose to share it with us, thanks.

[@bdubbsmark]

"I just looked like an idiot." It takes strength to admit when you are wrong. I appreciate you putting it out there.

[@trecou]

Strength that the president doesn't have XD

[@elibeaton7223]

Trey Coughlin yeah XD !

[@this_is_japes7409]

not really, it's just we have a bunch of weak people being bad examples. edit: i forgot the of

[@Windrider6]

@@trecou There are a lot of "presidents" in the world. The statement probably applies to almost all of them. XR

[@naveenarora6467]

@@Windrider6 nope

[@baumeisterjack9281]

I realy like how eventhough he didn't listen to him while performing the experiment, he took the time to reflect and admit that he was wrong.

[@ezequielrenovato6608]

Finally, a comment about the video content and not complaining about Premier. Thank you.

[@Navylonghorn10]

@Sandcastle • In regards to his religion, what if you were wrong and simply too committed to your own perspective to consider the possibility of an objective truth?

[@Kahandran]

@Sandcastle • I get it, but getting mad at people for being religious is very thought-policey.

[@Dashitishere22]

@@Navylonghorn10 yeah but when your objective truth conflicts with a bunch of other people's objective truths it's pretty clear to see there's no objective truth like religion

[@jmh1189]

@Sandcastle • "I'm not wrong" that's a bold statement regardless of the context.

[@titusdaniel]

Thanks for taking an interesting physics question, interpreting with humility, and turning it back on yourself in an honest and personal way. You're the best !

[@jseries101]

This model would make for some great water fountain art, I would love to see an artist build on this. :)

[@beaconofwierd1883]

Feels like you forgot to mention why the water travels ”ahead” when spraying inwards and ”behind” when spraying outward. The answer is simple geometry, when spraying inward the ”radius” decreases so the droplets travel faster than the shaft (since they have the tangential velocity at the tip). When spraying outward the ”radius” increases and the droplets travel slower than the imaginary extension of the pipes. Sure, just saying ”look at the resultant of velocities and remember that unless acted on by a force everything travels straight” explains the phenomena, but I feel like the simple geometry aspect explains the ”optical illusion” which really isn’t an illusion, the water is really shooting out in front and lagging behind the pipes, if you were to place something there (in the same rotational reference frame) it would become wet, so not really an ”illusion”.

[@lazlokovacs6876]

Thank you!

[@georgesabikhalil186]

Thank you, this really helped!!

[@Thomas-ez8ib]

I was confused about this before I read your comment. Thanks!

[@TheMilosDjuric]

The water droplets are 'drawing' a trace which looks like it's ahead or behind the nozzle, but they're just moving at an angle that changes relative to the rotating nozzles. The terms 'ahead' and ' behind' are not relevant in this dualistic system where one part is rotating (nozzles) and the other moving linearly, it's just the trace that gives us the false impression, while our brains fail to decode the movement of each individual droplet. Our brains also fail to decode other people's views and feelings when we assume to have authority on some subject. I wouldn't say any nation in particular exhibits this feature, but progressive, intelligent and educated folks can be arrogant, even without knowing it.

[@frollard]

This needs to be pinned. Absolutely the changing radius is the reason for 'curve' as angular momentum appears to turn into straight momentum.

[@justinteal495]

The fact you flew to england to play with a sprinkler in someones garden😂

[@C0DEWARR10R]

and got paid for it...

[@RickardoPandiangan]

In the of sains

[@HelloKittyFanMan.]

....is... what?

[@KaranChecker]

Anything for content which gets viewed nearly a million times ... in 4 days

[@spearshaker7974]

True love knows no bounds.

[@johngarfitt2863]

First Sprinkler: Once the water leaves the spout there is no Coreolis force to accelerate it tangentially that’s why it lags behind the sprinkler arms as it moves radially outward. Each particle has the same tangential velocity as it had when it left the nozzle. The drops would have to accelerate tangentially (via Coreolis force) to keep up with the arm as the drops move away from the centre of rotation. Once the drops leave the nozzles they travel in straight lines. Second sprinkler. This is the exact opposite of the first case. The flow appears to lead the arms because the water has the tangential velocity that it had when it left the nozzle. There is no Coreolis force to slow the water’s tangential velocity to match the arms. Since the tangential velocity at the nozzle is bigger than nearer the axis the water leads the arms.

[@nolistark5161]

Love this demonstration. Each design kind of emphasizes the two different frames of references. The first design makes it easier to visualize the pipes as the frame of reference as the water “trails behind.” And the second makes it easier to visualize the particle as the reference frame as it “moves forward” after it exits the pipe.

[@tomlischke2726]

Steve is a really smart guy if you ignore the British accent *talks in alabama*

[@Lambda_Ovine]

sidewards.

[@burekmali6704]

I'm starting to be worried for his daughter and son. 🙄

[@bigdomino5892]

@@burekmali6704 Why?

[@cimon07]

@@bigdomino5892 Alabama

[@bigdomino5892]

@@cimon07 OH!

[@danacraig2535]

Hey Steve , I’m 63 yo and started watching your vids. The sprinkler episode where you failed listen is familiar to me. What sets this off in my mind is your resemblance to a man of science. Sprinklers were one lesson and learning once again that we seldom Remember to listen adequately. Listening to another view when our own treasured view differs is easy to learn. I’ve learned that lessen dozens of times . Only to be surprised I’d forgotten it again.. Dana Craig Science is my passion that I can enjoy always , knowing the story never ends . “The person who was wrong always learns the most “. DC

[@pyrotas]

This is an awesome lecture on kinematics, enveloping trajectories and - most importantly - effective killer communication skills. Chapeau to both of you.

[@chrsfincher]

Im going to agree i was excited for a new video and then let down with a 9 hour timer

[@over9000713]

And Premiere is like a live video, its kinda laggy

[@wadurito]

Yep. Since channels started premiers I've turned off notifications for almost everyone..

[@theflyingdutchman787]

This is what I love about scientists: Admitting when you’re wrong and rejoice in finding out the truth.

[@vlanoik]

It's not about being right, it's about finding out what is right and why

[@rickwhite4137]

Scientist _have_ to admit if they're wrong. If not, they aren't scientists. But a professor! Someone heard a professor admit he was wrong about anything?

[@Gruuvin1]

If only governments were run by scientists and engineers instead of lawyers!

[@davidhunt6306]

If only scientists actually acted this way. Very many do not.

[@Gruuvin1]

@PracticalTech I agree with you. I just think it is unfortunate that government is run by lawyers who spend their lives IN government writing law to benefit themselves. Are they actually solving any problems? Most scientists and engineers are in the practical world solving real problems. We could benefit from a few more actual problem solvers rather than professional liars.

[@PhysioDetective]

Thanks for you for your humble approach Destin. And Steve’s graciousness.

[@Dcscockpit]

Takes a big person to admit what you did and transmit it in the way you did. Your one of my favorites on here.

[@manual1415]

When the two smartest kids in class have different answers.

[@seanriopel3132]

Or better yet, when your correct answer is different from the teachers!!! Nothing feels better than showing your professor you were in fact correct.

[@NemoConsequentae]

More like; the 2 smartest kids have the same answer, but by coming to it by different methods, or just describing the same method differently, and arguing over which approach was right. (When, in fact, both are equally valid.)

[@apaajaboleh104]

Civil War

[@aidanpratt]

Manuel Pilarczyk me, sitting in the back with neither of them.

[@frandurrieu6477]

Even better the smartest ones have different but the teacher puts you wrong and you were right so you correct her and both the smartest ones get rekt

[@DasGuntLord01]

"Be Nice" What a nice message! (Notices that it's written in comic sans) (Niceness dissipates)

[@Ranveer_sangha03]

1:01 that is a evil laugh haha jk He is lovely chap

[@Zman44444]

3:01 Poor Destin. His brain confused.

[@johnthomas4790]

Destin sneakily teaching everyone vector addition lol

[@jennifer7685]

John Thomas i got smarter today

[@workout9594]

John Thomas hold up hold up you are telling me I've learned something similar to something advanced (for me atleast)

[@Beef4Dinner22]

But then at 6 minutes, he describes the two vectors and for some reason comes to the wrong conclusion on their sum.

[@shawndavis8576]

Hopefully also teaching us humility and problem resolution.

[@iAmTheOneAndOnlyE]

I noticed that lol

[@KevinVanGelder]

Don't use Premier feature. KZbin intentionally makes them show up in the feed like normal videos when they can't be played.

[@regguy69]

Well... they can't be played because it's premiering in 9 hours. The premier feature is simply a way to announce to viewers that there is a video coming up soon.

[@MrPronoz]

And usualy video gets lost in news feed and gets way less views and bunch of dislikes froj people who thought it was a niew video

[@connorbaniak]

agreed, its a clickbait feeling.

[@GARBO96]

@@regguy69 that's what notifications are for

[@Gunbudder]

@@regguy69 You can also announce to viewers there will be a video by releasing the video and having it actually show up in the feed. KZbin is entirely on demand. Why on earth would you ever need advance knowledge that a video will come out soon? You could watch when it comes out or watch in 30,000 years, and it makes no difference.

[@BringerOfD]

I'm learning long range shooting right now, and as i was going through the material this video came to mind. This is a physical demonstration of the Coriolis effect and why it always shifts to the right in the northern hemisphere and left in the southern, regardless of direction of fire!

[@richardvanvoorhis306]

This is very reminiscent of the Coriolis effect! Always fascinating content, Destin. Thanks!

[@donlars1]

best part is from 9:00 when Destin reflects on the "SmarterEveryDay Moment", this is important. Thanks as always.

[@duroxkilo]

it really is quite a moment. we all think about it, practice it and then for some reason abandon or omit it... it's almost like being calm and patient is unnatural :}

[@CabelCabelCabel]

Yup really important point from Destin! I mean he basically became less american after that experience.

[@HalvardSkurve]

8:26 is important

[@stanmakrushin]

02:48 - “that’s the opposite of most people’s intuition” - agreed🤔

[@Dannzegos]

So appreciate your self-honesty and self-reflection.

[@JoeBuk724]

5:17 💡 That white circle finally made me understand. That’s so cool!

[@nikkoj5356]

9:57 Stop, collaborate and listen. You've just learned the first lesson of Vanilla Ice.

[@vitsalava1251]

underappreciated comment :D

[@tactcom7]

Obligatory you win the Internet comment.

[@Pho8os]

You deserve a like for phase insertion.

[@markthurst9751]

And as an official member of the Internet Grammar Police Department, i would like to commend you on your good grammar sir.

[@tactcom7]

@@markthurst9751 *I. Consider yourself dismissed.

[@StephenBroadfoot]

Hey Destin, video request! In the book "Surely you're joking Mr Feynman" at the end of the chapter of the same name, Feynman describes an experiment he did with spinning water pipes. In the experiment, he sets up an S shaped pipe and forces water through it and asks, which way will the pipe spin? Then asks the question, if instead, the whole thing were submerged in water, and we suck water through the S shaped pipe, which way will the pipe spin? Unfortunately, the chapter ends with him breaking some Princeton equipment and we don't get to find out which way it spins! I think this would be an awesome follow up video to make!

[@AbhiroopTito]

I really hope one of these science youtubers pick this up. I am still intrigued to find the answer out

[@nortongartino4602]

That's a really good cliffhanger

[@rjscalise]

When sucking water, the sprinkler will not spin at all. This is in fact what Feynman observed, but he thought incorrectly that the problem was not enough pressure. When he applied more pressure, the tank exploded. A video would be a very good idea.

[@UpStuff]

Everyone on earth needs to hear and understand what you said starting at 9:08. Thank you both for the vid!

[@ethran]

Wow! I love that step back you take at the end of the video. It's super tough to even realise when we are doing that and then even tougher to admit it and work to modify our behaviour. Kudos to you sir!

[@samuelunderwood5286]

Here's a way to intuit this result: If two objects are in circular motion with the same tangential velocity, but with different radii, the one with the smaller radius will have a higher angular velocity, which means it will complete the circle in less time. Think of a fan blade. The end of the blade has a much higher tangential speed than the base even though both parts of the blade complete the circle in the same amount of time. If you decrease the radius, but keep tangential velocity the same, you get a greater angular speed, which explains why the water moving inwards leads, while the water moving outwards trails.

[@ZoidsNut]

Aha! Thank you for that!

[@m4r_y0]

Beat me to it

[@balzi76]

@@m4r_y0 This is false as the droplets are no longer in circular motion after leaving the nozzle. What force acts on them to keep them rotating? None in my opinion.

[@m4r_y0]

Matthew Bowles you are correct the droplets doesn’t have a circular path. But it still does apply. Meaning the distance between the droplet and the center in the second test is is getting smaller, vs in the first test is getting bigger. So relative to the nozzle end, the droplets can be ahead or behind it since the nozzle end doesn’t change its distance which is the radius

[@balzi76]

@@m4r_y0 I think I understand what you're saying, but because the droplets don't have a circular path, the initial state does NOT have two objects in circular motion, so any effects of their relative radii and angular velocity are not applicable. right?

[@DarthCalculus]

Your wisdom at the end... Was wise "Wiser Every Day"

[@micjr21]

I'm not sure how many times I've watched this video, but it definitely never gets old

[@gamegreg]

Another way of interpreting the perceived flying in front of the nozzle is with the radius r and angular velocity w and sideways velocity vs: (w=vs/r) If the nozzle is pointed outwards the radius of rotation increases and with the same sideways velocity the angular velocity is smaller, so the water laggs behind. The same applies with the nozzle inward: the radius decreases and with the same sideways velocity the angular velocity increases and the water is in front.

[@Mariano.Bernacki]

Dear Destin: Premieres are a guaranteed way to lower your view count. 1) They annoy subscribers, who see you've made a video but they can't watch it. 2) It punishes people for checking their subscriptions. 3) The like/dislike ratio should be enough evidence by itself. I hope you get "Smarter Today" and never use this ridiculous feature again. Thanks from an early subscriber (been here since 10k subs or so)

[@MilA-eh3gf]

Great analysis on the implications of the feature. Logically sound and well-put. Glad to see this among the sea of just “I don’t like it it’s annoying”. Hope Dustin sees it!

[@sinom]

It is really good for some things. But usually only videos over 40 minutes and when the creator is present in chat. Since this video didn't meet either one of the criteria it isn't really good for premieres

[@painkiller5657]

Didn't initially dislike but did so now for your point. 100% agree. It's ok if youtube doesn't "recommend" it like it's a normal video.

[@qwertyuiop-rg4mj]

man i didnt even dislike because of premier, im fed up with the annoying "im american therefore i think this way" jokes

[@KuraIthys]

I'm not super-bothered by it, but I DO have to wonder what the point of them is. I see so many youtubers doing it - it seems improbable that they're doing something with no upside whatsoever... But I can't identify what the upside might be... Even if this upside of premieres is illusory in practice, there still has to at least be the IDEA of some kind of benefit, so... What would it be, exactly?

[@CerealScaresMe]

Please don't do premieres They show up normally in our subscription feed and get buried by other channels content by the time we can watch the video. This leaves us forgetting that you posted anything in the first place.

[@sirsymbro]

basically what i said too... wow there is a lot of hate on this feature here. lol

[@ronswanson5551]

Exactly. It just hurts the creator in the end, especially for such a long premier time like Destin posted.

[@CerealScaresMe]

@Mycel does it work like that for everyone, or just a select few? Mine does not work like that.

[@Quazlyy]

I found that thinking of the extreme cases really helped me get an intuition for the direction of the curvature. The only way for a droplet to hit the center of rotation is if its velocity has no tangential component. So that can only happen when the wheel is stationary (or when the exit velocity is infinite). If, however, the rotation velocity is very large, then the radial velocity component becomes negligible and the droplets fly off tangentially in the direction of rotation. So for any angular velocity in-between, the droplets will be flying past the center in a way that makes the stream look like it's leading the position of the spout

[@unit0007]

Not sure if this has already been mentioned, cause I'm not going to read 5000 comments. But not too long ago Tom Scott made a video about an Artificial Gravity Lab, where they discuss the Coriolis effect on a small scale. And they demonstrate how quickly this very unintuitive effect becomes intuitive when you are in the rotating environment instead of looking at it from the outside. Also a guy called Destin from a channel called SmarterEveryDay made a video on the Coriolis effect few years ago. Maybe you could ask him to explain it for you. Keep up the good work, I luv you bye

[@derangedchicken2191]

you really need to have one of those sprayers with a variable speed motor, hand spinning is just not enough! some one call Mark Rober please.

[@TheStevenstatzer]

Deranged Chicken paging science KZbin, aisle 4.

[@derangedchicken2191]

@@TheStevenstatzer yes please...

[@MattCookesurl]

You're in Britain, better call on Colin Furze

[@erikroberts9165]

simply punch a hole in the side of your copper pipe, just before the bend

[@Superknullisch]

@@erikroberts9165 Good thinking!

[@Meoiswa]

The lesson for today: Rotating reference frames are FREAKY

[@seanriopel3132]

As Einstein said, It's all relative.

[@TheDanyschannel]

Coriolis acceleration! I suffered through dynamics and mechanism kinematics. Super interesting though

[@pyr0static]

What's happening in the video makes perfect sense, I just can't manage to convince my eyes of that.

[@userPrehistoricman]

Jeremy, what are you referring to?

[@mbisson5816]

@@JeremyLogan Jeremy scores on a low blow. Destin opens himself up to criticism by admitting his faults, and you take the opportunity. Congratulations.

[@vitor900000]

There is one thing you guys didn't show. 7:54 If you increase the rotation speed of the "reverse sprinkler" the curvature you see the water making will flip and start to lag behind instead of being in front of the direction of rotation. Not only that but instead of a parabola curving out of the circle it will be curving in like a spiral. You see that parabola curving out in front of the direction of rotation because the water of moving faster than that "reverse sprinkler" direction of rotation. When their speed equalize you will see some kind of mushroom shape and maybe even make a Laminar Flow because the water that is getting out of the tube will collide with the water that is getting out of the tube. Be aware that the water inside those tubes are experiencing centrifugal effect and because of that the faster you spin the "reverse sprinkler" the faster the water will want to get out of the tubes so you may need to add a flow restriction to make the effect easier to produce.

[@Andrewlang90]

Nothing better then two grown men sitting at a kids Punic table debating a waters direction out of a sprinkler recording with a $6K camera. This is the kinda quality I love from Smarter Everyday

[@davidbergmann8948]

I thought KZbin killed premieres a few weeks ago because they're an utter failure. An effective way to decrease your views.

[@m00hk00h]

That was before they pushed the video up in your feed as if it was released at the premiere time. It used to be that it showed up in your feet and you couldn't watch it and then other stuff that got released pushed it down and it stayed there even after the premiere. They fixed that. That was my primary complain about premieres.

[@odw32]

The only thing physics and politics have in common: Whether positions and movements are positive or negative, it all depends on your frame of reference.

[@mariovelez578]

the frame of reference needs to be inertial to hold true

[@spruce_goose5169]

@@mariovelez578 but an inertial frame can only define positive and negative values based on acceleration, not 'direction'. In the case of two political ideas diverging from each other, there is no 'true' frame of reference to define which is 'positive' and which is 'negative' (or constant). In the case of a political movement with 'acceleration' (I dunno the apt analogy for that, support growing for it maybe?) then at that point we can say one idea is steady state while the other is changing. In the case of the video experiment, the object which is accelerating is the tube apparatus (not the water). If I was (politically) water, I would be correct to say that those darned water pipe party members are always changing, I'm just going about my business! :) If I was part of the tubing party, I'd have to say, yeah the water party isn't 'accelerating backwards' but they're not keeping up with the times! (Oh the times, they are a changin')

[@macleadg]

Orian de Wit Pfft. That’s what you think. 😜

[@mariovelez578]

@@spruce_goose5169 politics?

[@spruce_goose5169]

@@mariovelez578 What's your question? Orian brought up politics. You responded. I responded. Attempting to extend the analogy as far and accurately as possible. All for fun. Is really meaningless

[@MrHeroicDemon]

For all them gun bullet comments "There are guns that shoot in a 90 degree bend of a gun, but the bullet will still travel forward unless you were to move fast enough, in which case water was moving at a rate, and the hose was moving at a rate, you'd need to scale up everything, for the direction of your movement of the barrel of the gun to implement a "curve" but it'd be forward+yoursideward movement in a straight line, diagonal, so there wouldn't be a curve, like the water drop shown. Tlaloc_temporal is right, projectiles curve all the time, but to implement your own curve would have to be intentional and not due to your movement of the barrel, unless you want to move the bullet diagonal."

[@daisy9152]

Important to note that centrifugal force on the water exiting the nozzle creates negative/zero pressure in the first scenario and positive pressure in the second scenario. This changes how much of the rotational energy is delivered to the water droplet as either radial or tangential velocity.

[@user-vn7ce5ig1z]

10:04 - So basically, you're saying that you learned to _stop, collaborate, and listen_ ? 🤔

[@LisaBowers]

Nice, nice, baby.

[@surfstarcc1]

Hahahahah very nice!!

[@damnecuadorian]

Like to state motto of Alabama: Anything less than the best is a felony. And Premiere is less than the best, Destin.

[@seanriopel3132]

Touche!!!!

[@vitorgas1]

"this is a language problem" - destin, trying to sound less wrong

[@piemaster831]

I thought it was really annoying how he kept saying "as an American" and "I'm fr Alabama." Like it's science dude, it's the same no matter where your from.

[@bumpsy]

@@piemaster831 yeah as if he thinks fundamentally different about physics just because he's american and steve isn't 😂

[@jetison333]

@@piemaster831 hes just joking around because he said sideways instead of like tangential.

[@xBris]

​@@piemaster831 Thank you. As a fellow scientist, I got really annoyed by that. Sure, he was just joking, but injecting nationalism into a scientific topic even as a joke gets me angry. Scientists all around the world unite and don't give a flick about nations - except a subset of Americans, because 'murica. That's just sad and annoying :(

[@Lardzor]

Well, if it's a language problem, Steve is from England, and they invented English. So I don't think it's his problem.

[@grantforsythe1280]

I love how you add the relational epiphany at the end! "When I disagree with someone, or at least I think I disagree with someone, it is imperative that I stop, I listen, and I don't move on until I completely understand the other person's perspective.

[@kevinogilvie366]

I love how you explain about different perspectives and tell people to try to listen to other people's opinions because the other person may be right.

[@gabboaudo]

10:19 It doesn't fell right at all. But it makes perfect sense.

[@TarasMazepa]

I hate premieres so much. It is like punishment for people checking their subscription feed.

[@ShadowoftheDead]

Exactly

[@sangramloke941]

destin always leaves me amazed by just these simple physics which i thought i knew but didnt.

[@jamesthomas6984]

I like how you each had a half of the full description. This is my favourite type of misunderstanding, where you can learn to communicate how something works from multiple viewpoints, and isolated vs general effects.

[@supernumex]

The premier feature makes me really disappointed when i click on a video :(

[@thanksfernuthin]

Yeah. I don't think it's helpful actually.

[@TBD98]

Why? The thumbnail says premiere at the bottom.

[@thanksfernuthin]

@@TBD98, premiere can be a verb. It's premiering right when you see it. Maybe people will get used to it over time but for now, I and most people don't even see the word anyway.

[@BigRawb666]

@@thanksfernuthin I hate it. I'll Also forget about the video when they come out and forget to watch it. I seen the video and was interested in watching it. It's a highly disappointing feature

[@alunmo]

Be like me and unsubscribe.

[@wade7959]

Destin: "If you think about it, it makes sense." Me: "No. No, it doesn't."

[@RICDirector]

No, it doesn't. My brain just turned itself into a pretzel. If you move a nozzle like that, the water should 'trail behind' as each particle is ejected on its path. I don't know why I can't get PAST that....!! Frustrating!

[@bowmanbk1]

@@RICDirector Ditto. I'm with you. The more I think about it the more my brain hurts. As much as Destin's arrows add up and make sense, my eyes still tell me somethings wrong here...

[@bjh3612]

As someone who like physics in high school and college at first I predicted what it was going to do. but as soon as Destin said it would lag behind my brain. decided all that math stuff is wrong and to go with what feels right, the water lagging behind. this is something our brains like to do to us. we will use our preconceived model of the world, based on or daily experience, to predict things; even if a more accurate math based model exists saying it is wrong. And this is hard to overcome as our brain does not like being wrong. I am glad for videos like these, because they still show me that I haven't fully gotten over this flaw of overconfidence in my predictive skills

[@martinharding]

@@RICDirector You are only used to the water coming out on the outside of the turn, as with the first example in this video. the second example the water is being fired in the opposite direction, into the inside of the turn and hence the opposite happens. If you only ever had your lead tilted to the left, objects would drop to your left with gravity. If you tilted your head to the right, objects would drop the "wrong way" to the right, but they would still be following the laws of gravity.

[@RICDirector]

@@martinharding Sorry, great explanation, but my brain is still insisting that something is wrong! I hope Destin does another, more involved, video that takes it even more simply to help those of us like me....whose brains need a good stirring up! :)

[@chyraglyde143]

Oh wow! I thought that it was trailing, and I was so confused when destin said it wasn’t. But now I get it! It looks like it is, but instead it’s going in a strait line forward. I love this!

[@xidarian]

The inner radius is smaller so the water gets ahead of the arms on the snapshot. If that makes sense to anyone. Until I thought about it like that it was breaking my brain. I can understand the lines and the diagram but it didn't make sense that it was ahead of the arms until I considered the angular distance and how the radius of an imaginary circle it is being flung from effects it.

[@Yora21]

I would love to see it with the image rotating at the same rate as the arms, so that the perspective changes to a rotating reference frame.

[@johnbarron4265]

Each water jet would appear to be in a fixed position in space, as long as the sprinkler head angular velocity is maintained constant.

[@Shermack98]

@@johnbarron4265 Thats pretty much the coriolis effect if im not mistaken.... a curving force appears lineal because of a rotating frame of reference.

[@mrkiky]

@@johnbarron4265 But the lets would still appear to be curving which would look cool.

[@johngarfitt2863]

A photo taken from a rotating frame and a photo taken from a stationary frame would be indistinguishable. A video taken from a rotating frame would show fixed arms with the water curving behind the arm (in the first case) and ahead in the second case.

[@aravindhsm1287]

You would see it moving away from you in a straight line.

[@AlexTaradov]

Premieres suck. The only way I watch this video no if I remember about it, which it unlikely. The whole point of video on demand that it is on demand.

[@vshazam]

It still sends out a notification and repositions in your Subscription feed when it goes live though? The only thing that's different is it lets you know before hand when a video will be uploaded.

[@vshazam]

@@CamaroZ28Nut3 you don't have to rearrange your schedule though. You're free to watch it whenever you want.

[@vshazam]

@@CamaroZ28Nut3 The reason the premier comments out number comments about the video is because everyone could comment for 8 hours before the video even went live. Sort them by new, you'll see a huge difference.

[@travisyayes6343]

Destin, you are next level. This is a great way to bring light to the main problem we have today. We have all lost the ability to empathize. Stop talking and listen. Just leave it at that.

[@razordu30]

I love love love this moment about taking the time to understand the other person. Awesome takeaway. Great moment of humility.

[@goldenduck7294]

It's been said that no one likes the premier feature.

[@znerolz]

It is known khaleesi.

[@Vistrus]

At least the premier's that are hours out from release

[@Basement-Science]

It is known.

[@marc_frank]

chill

[@GummieI]

And it is wrong that noone likes it, cause I actually do like it, in fact find it to be an awesome concept

[@TheBest14184]

If you’re going to use this awful premiere feature, at least make it a wait of like ten mins or so, not multiple hours.

[@dannass5]

Yes, you're using this feature wrong! But its all good

[@MrE_]

It's not his fault, its KZbin's fault

[@neilnolte2587]

9:10 - 10:12 62 seconds that can change your life. Thank you Destin!

[@albertmendoza1468]

This is how I think of this problem: For the first case where the pipes were spurting out the water outwards (away from the center), I think the "real" illusion there was the distance between the end of the pipe and some droplet always increases since the pipe is moving away from it. On the other hand, when the water was being spurted inwards (towards the center), the distance instead decreases, giving the apparent illusion. It will be easier to understand what I just said if you imagine it from the pipe's perspective.

[@Gunbudder]

Dude, i HATE premiers. What purpose do they actually serve? Is this broadcast TV, where it is physically impossible to broadcast more than one show at a time, thereby necessitating a schedule of shows played at specific times in series? Or is this the internet where you can digitally transfer files at upwards of 100 Gb/s to millions, if not billions of people at the same time, on demand?

[@marc_frank]

chill

[@iseewhatyoudid2944]

Superchats may be ?🤔

[@93DavidJ]

All uploads are scheduled anyway, why not have it premier in a way people can enjoy it together?

[@LostieTrekieTechie]

Then wait until after.

[@AndrewMeyer]

This is the internet, where _both_ viewing modes possible. You can premiere videos live in a way that allows people to enjoy them together, _and_ still have the final video be available for others to watch later at their leisure in case they can't or don't want to catch it live.

[@DanielDuhon]

“Side wards” Sounds just like me 😂

[@saftschinken2353]

Side warts xD

[@PhilDotZap]

The lesson of the day "Knowing is half the battle..." to pause and deeply work to listen and understand the other person and their perspective, is a great lesson.

[@kaptainjudeandcrew6490]

This is how I think about the water is wet argument. I think about a single particle rather than a large sum of water. It’s not wet.

[@Spirit532]

How to make the Adobe Acrobat logo: the wet way.

[@marekstanek112]

with burning fuel on ultra violence

[@davidemusilli4047]

Come on man, spolers

[@banjolearner94]

i dont watch youtube with a schedule in mind.

[@93DavidJ]

All videos are scheduled anyway, why not get the warning that a video is about to be released?

[@93DavidJ]

@@CamaroZ28Nut3 So you'd rather just simply not know it's about to be released at all? That doesn't make any sense. The video is going to be released at the same time no matter what.

[@93DavidJ]

Because whether you realize it or not, releases ARE always scheduled in advance. Destin doesn't just finish a video and slap it up whenever it happens to be done, releases are scheduled so that the most amount of people as possible see it as it goes live to help the video perform well. A premier just allows more people to be aware of WHEN it goes live. And it's been a massive success for that.

[@93DavidJ]

@@CamaroZ28Nut3 Well, then look past it, because there are plenty of people who do like it.

[@banjolearner94]

@@93DavidJ theres a downvote button on comments for people who disagree. quite positive the masses agree

[@jeanf6295]

Well, to get straight line the water would need to move faster with distance to the center of rotation, hence the lagging behind illusion with the first apparatus and going forward illusion with the second one. That is a nice way to visualize the Euler and Coriolis force effects.

[@Pscribbled]

I feel like you can see this by trying to think of the water with rotational velocity where if you shoot the water outwards, since the water will be travelling at the same velocity as it was when it gets shot out of the nozzel, the rotational velocity of the water slows. So it lags behind. Vice-versa for shooting inwards where the rotational velocity increases so the water leads in the snapshot

[@Arquimedes_Aram]

I love your conclusion advice... 9:59 we need always to stop, listen and take the time to complete understand the others person perspective. :D AWESOME episode!! Thank you so much for this!!

[@TheMrAshley2010]

+

[@GertGybels]

couldn't agree more.

[@mozvidz]

This is the first, and hopefully the last I see this premier feature on your channel. Because now I won't come back to this video when ready, it's time is gone. This is a feature for socialites. Be better next time, be smarter! Edit: Okay, I'm back because I still have notifications on. That's a very humble back yard, Steve.

[@ChuckSommerville]

9:05, very important message about how we communicate. Thanks.

[@sammiddleton7663]

I think part of the confusion could be the difference between pathlines (the trajectory of a single particle in a fluid) and streaklines (a curve connecting all the particles that pass through a particular point). Destin tends to talk about pathlines, while Steve talks about streaklines. There are also streamlines, which smoothly connect velocity vectors.

[@thatmcgamer3106]

Got really excited when I saw the video. Then got really sad when it said it was a premiere

[@ThetaReactor]

Phenomenon: the compulsion to Like a SmarterEveryDay video before watching it because you know it's gonna be good. We'll call it preDestination.

[@LadyPatienceK]

Genius comment!

[@RICDirector]

**groans and runs for shelter** AUUUGGGGHHHH!!!!!! Well played!

[@nathanwaldock782]

Awesome!!

[@jacksonpascoe789]

ThetaReactor pre Dustination

[@danielgreen5803]

Physics problems that humbles you when it goes against your "Phynstincts" is the main reason i went to study physics. Keep them coming Destin!!

[@madmonty4761]

The center facing spouts were mesmerizing. It almost gives you a uneasy feeling, like this does not make sense! It would be really cool to see paint droplets coming out of it and seeing the cool patterns on grass or a wall. Thanks for the amazing videos Destin.

[@MutantParsleY]

Don't use premier feature please!

[@luigimacaraig5076]

"In a way the science is often a long, slow, passive-aggressive argument." -zefrank1

[@wesmiller1210]

So who is going to make a wonderful fountain with Steve's idea and variable speed. I could stare at that for hours. LOL

[@TheTechAdmin]

3:32 I like how you change your answer, so that way you're right either way. But Steve, being smarter, picks up on that. You can see that he caught you because Steve does that classic subsonscience "shame, shame" finger gesture, lol.