Pendulum Wave Demonstration

[@MrPoddu]

The best part of this demonstration is the audio component. There are patterns in the sound, just as there are in the visuals. I know of no other demonstration where you can hear the pendulum "sing" like this. A great touch!

[@owenbartrop8963]

Yeah but it puts everything out of whack pretty quickly the ones with a shorter oscillation lose more energy than the ones with a higher oscillation and by the end they aren't lining up at all, well slightly.

[@Taylanyasinkaygusuz]

“Sing”?

[@JosephOster]

Except for the coughing. :(

[@JosephOster]

@@owenbartrop8963 Would be better without physical contact, using a light beam to trigger sounds.

[@jgbelmont]

You have not been around long.

[@trevisbest]

This is the sort of stuff KZbin should be for.

[@timspiker]

I don't know. I think breaking my brain once is enough for one day.

[@zareh805]

It used to be

[@brumfiba]

Yeah this and fart videos

[@johnnyfreedom3437]

This is just unbelievably cool! I never would have guessed they would have split apart into a disjointed mess and come back together and do it over and over again! I'd love to hear the science lecture that goes with this! Almost 70, never too old to learn!

[@bobh6728]

The strings are different lengths which affects how long it takes to swing, that is the period. If you ever had a grandfather clock, the pendulum could be adjusted by raising or lower the weight on the end so that it swung exactly once per second. (The numbers following may not be the ones used in this demonstration but it illustrates the point). So what they did was determine how long to make the string so the first ball swung 50 times in 60 seconds. The next one is slightly shorter so it swings faster at 51 times in 60 seconds. The next 52 times and so on. At the end of 60 seconds they will all have completed a different number of COMPLETE swings so they will all be back in the original alignment. At 30 seconds the first ball will have completed 25 swings, the third ball completed 26 swings, etc. So every other ball are now lined up. The ball that completes 51 swings in 60 seconds completes 25-1/2 swings in that 30 seconds. So it is opposite the first group. The same with the balls that are “tuned” to 53, 55, etc in 60 seconds because they complete 24-1/2, 23-1/2, etc swings. It is the fraction of a swing that determines where each ball will be in relation to the others. At one point you see 4 lines of balls. That is when some have completed full swings, some half a swing past a completed swing, some 1/4, and some 3/4. All of the other patterns can be explained the same way. The “snake” is when the first completes a swing the next circle completes a fraction (say 1/10) more the next another 1/10 more and so on, so it looks like they are following each other. A lot looks like total chaos, but will eventually come back to where they all complete a swing at the same time.

[@fasterpussycatkillkill9650]

No, you never are! Keep looking and learning.

[@fredgervinm.p.3315]

​@@bobh6728 Teachers are a special breed, they make all the difference in learning...

[@patrickganly5206]

​@@bobh6728 I haven't done the research yet, but what you say sounds very plausible!

[@aussieblue7132]

@@fredgervinm.p.3315But most only teach what they are told too unfortunately

[@AmpDecay]

The polyrhythms this creates are absolutely beautiful, music in a pure form

[@SprigganFR]

This is the kind of creative teaching that can really make an impact on a student. Kudos to this teacher. For me it reminds me of orbital mechanics, and how they can be so chaotic and so synchronized at the same time.

[@danamathews5712]

He is ONE AWESOME teacher - a true educator!!!!! I loved his classes and his hands-on approach.,

[@TheHunted385]

Except, theyre saying that its God doing this... No, its physics.

[@MartyMcFly-n4l]

The thing about orbital mechanics that always makes me crazy is the fact that if it's here for you to see, it's a stable system. If it were chaotic, it wouldn't be here. Just a long for the ride, hoping to overcome physics before our host star dies.

[@squidvis]

​@@TheHunted385 And we have physics because of.... You're sooo close to getting it.

[@TheHunted385]

@@squidvis We dont know why we have physics. Claiming its God is just as speculative as claiming were in a simulation or its made of magic.

[@bunnyfeet1005]

Simply amazing. This reminds me the importance of experiment and see the real thing working, not just computers simulation

[@mollykins8h]

Oh no people are growing up and seeing things on a screen before they see it for real 😨😰🤕

[@pablo_ponchito]

That's pretty awesome to see there's so many different patterns in a simple wave...

[@iravi04]

It's amazing to think how far we have come with science and yet such a simple thing is so mesmerizing and beautiful.

[@tomshimko4688]

This is truly incredible. On a similar note, back when I was in high school (almost 60 years ago), the chemistry teacher had a demo showing water boiling at room temperature. An incredible "aha moment" for me. Became a chemist.

[@highdownmartin]

Vacuum bell?

[@enekaitzteixeira7010]

Boiling at room temperature? Do you mean evaporation?

[@FranktheDachshund]

Water in the vacuum chamber did it for me too, alarm clock in the vacuum chamber was another good one.

[@VictorPonce-o6q]

A mathematician can explain this....😳

[@bobh6728]

@@enekaitzteixeira7010No, it would be boiling.

[@jvg122ifly]

I had seen the Harvard video a couple years back and had to make one. My kids and I used golf balls, PVC pipe for the frame and fishing line. It worked great! A lot of fun. At a couple science fairs the kids would line up to take turns to lie under the pendulum wave as it cycled through ... Good stuff.

[@elizabethscott6798]

I love the incorporation of sound to the visuals of the wave!❤

[@Duben-ym5vi]

I. am 73. I never saw this before. Fascinating!

[@fauxque5057]

There's much better examples of it. This one was pretty crude.

[@МммМмм-ю7х]

Конечно не видел. Раньше не было ютуба

[@Mercedes4eva]

We are all the same age on the Internet, because of it

[@lasarack]

10/10 Thank you for all that information in the description! that vote was well deserved

[@theurbangentry]

One of the most amazing things I have ever seen.... its breakdown of music theory by the magic of maths and physics really reminds me really how incredible the universe is. Thank you so much for sharing.

[@CatherineSTodd]

kzbin.info/www/bejne/sHLbhWOjh6yopbs

[@MarttiSuomivuori]

Well formulated. I tried to say the same thing, no success.

[@marybethleib8286]

Oh... I thought the universe happened by random accident!!!!!

[@chumleyk]

Pretentious chav.

[@tampazeke4587]

To correct the lady. The ones on longer strings don't go slower. They actually go the same speed. They just go further since their wave cycle is longer than those on shorter strings. Because their cycle is longer, the period to complete the cycle is longer giving the illusion that they go slower.

[@luke_fabis]

I think they were going by the colloquial meaning of slower. Not that the velocity is lower, but that it takes longer to complete a cycle.

[@MikeyT2255]

Try explaining your way to a child lol

[@tampazeke4587]

@WhoaBo Hunkered down in my bunker. All my windows and doors are boarded up but we can still hear the wind roaring and howling. It's very scary right now.

[@SmaugDaDragon]

And then the teacher said; "now kids we have the obstacle course ready" - first one through get's a free dinner!

[@Josh-yr7gd]

I thought it was an obstacle course too, looking at the thumbnail.

[@sarahdeason5875]

😂

[@keepcalmandenjoythedecline]

Class buffoon: -¡Leeeeeroy Jjjjjjjjenkiiiiiiins! Muah-hahaha!

[@sandradavis7862]

im not a very science person but this was very interesting and made me want to learn more....loved it

[@MrAmazingChris]

And Kids asked their teacher: "Why is this happening, how does it work?" He replied "I have no idea, but this is awesome, right?"

[@SammyJoeLouis]

Lol 😆

[@snowy_1028]

Because time of pendulum depends on length of pendulum Longer needs long time 🤠

[@Creepersoop]

It's because the string that's holding each mass is shorter/longer

[@edwardgobbo9685]

'Homeschooled?'

[@JimJones-h3k]

Climate change. Climate change is the reason this happens. It’s all about climate change. Paint things orange you til the climate changes back to the previous time the climate changed and then the climate won’t change anymore and then unclimate change will be the new climate change change

[@colin_hart]

There are 16 balls total and according to the comments they swing between 50 and 65 times over the whole period until they are synced up again. Assuming simple pendulum, T=2pi*sqrt(L/g)So the longest one is 1.65x the length of the shortest one. The slowest one (longest) is 1.0404x longer than the second slowest. The second fastest one is 1.03149x longer than the fastest one.The longest one is 8' 4 5/64" (2.5419m)

[@rustneversleeps01]

That hurts my brain just reading it

[@timothyblazer1749]

Also, they are all connected to the same pipe. There is a small amount of energy being transmitted through that pipe continuously that harmonizes the action as well. This is simply provable with metronomes that do not sync when isolated.

[@bobh6728]

@@timothyblazer1749They could all be suspended from different supports and it would still behave this way. It is not dependent on any feed back mechanism. It is strictly the different periods of oscillation because of the length of the strings.

[@timothyblazer1749]

@@bobh6728 I would bet money that it would be similar, but different in practice. I'm familiar with pendulums, and I did some work with double pendulums back in college. I don't think it would be as smooth.

[@Skyhawker6177]

Curious: were the small lengths of pipe that the pendulum balls swung over magnetized? Seems to me that the orbs would have come to complete stop after so many swings without some sort of energy to keep them energized. I'm just a layman but isn't friction a big factor here that should inhibit the orbs from swinging continuously? Just saying..

[@NickMoore]

YES! Thank you for this awesome demo!

[@10231898]

Wonderful pendulums is so fascinating. Great artwork! Congratulations on a great video too!.

[@Vacardi]

Very well done! Fantastic visual explanation!

[@DonoVideoProductions]

I hope that kid survived whooping cough.

[@Hoaxer51]

I think he hacked up part of his lung watching this demonstration. Lol

[@YTKensei]

I feel so horrible for laughing as hard as I did at this comment.

[@fauxque5057]

Thought it was the vid

[@definitelynotanAIchatbot]

It's AIDS. Believe me, I would know.

[@hollyfleur6144]

poor child. he sounded really ill. i hope no one else came down with whatever he had.

[@annabrown4251]

Love this! Makes me miss our place up there in those mountains! Great folks up there!

If we ever want to catch up in STEM we need more teachers presenting kids science in an amenable manner like this.

[@Jeremy.Bearemy]

I was almost asleep until 2:53

[@albertdorio7189]

I could watch and listen to that for hours on end!

[@erasure999]

Someone get that damn kid with a cough some Robitussin.

[@jimmyday656]

Yeah after the VID I still look at a coughing person like they are a serial killer

[@PinoyBowlerGS92]

As a Youth Bowler myself, this is very creative. Great job !

[@chronoallusion]

Summer camp gauntlets have come a long way

[@cyn4476]

I'm not sure how you didn't get more likes. I'm still chuckling over here.

[@BobfromSydney]

This is a perfect example of math being beautiful. When the frequencies of the pendulums line up at certain points it is mesmerising. An amazing demonstration!

[@Travelightly1]

I love how this brought out such enthusiasm from the kids! Yay teachers :)

[@HotCuppaCoffee]

Physics is so cool. And building big examples of complex physical principles, in your backyard, is just plain awesome!

[@chrisose4585]

They’ve got some balls showing this

[@medalion1390]

Some big brass balls

[@chharlessweeney]

Top class observation!!!

[@ValeraCarpenter]

Классное видео! Физика!

[@spiritflower6640]

This was wonderful to watch.Thank you for sharing it. I am grateful also to the people who took the time, care and know how to build thisI only wish that they had filmed it until it returned back to as it started

[@bonobonation9892]

in the last moments of the video you can hear the person explaining how the physics work: #God did it. Pity to see such natural beauty soiled with #superstition .

[@ZarahMcIntosh]

If God is all then how could it had not been God? duh. lol

[@shaneoshea8431]

Zarah McIntosh "God" isn't all, that's how. Fairy tails are for children.

[@ZarahMcIntosh]

Shane Oshea lol then it means we all have different definitions for "God".

[@VigilantPigeon]

Zarah McIntosh And most likely they're all wrong.

[@ZarahMcIntosh]

Vigilant Pigeon I know I'm not wrong :) and there's nothing anyone else can do about it.

[@edlauren9434]

Шикарно! Я смотрел затаив дыхание! Очень показательно и доходчиво! Спасибо!!

[@marymactavish]

three minutes of staring ... wow. #physics

[@tamouse]

Thank you!

[@Blues40]

One of the best videos on KZbin

[@MichaelMolli]

It's some kind of relaxing watching this.

[@RoseblueShaman]

Bravo! Clap, Clap!!! Very intriguing... Loved it. Thanks for the awesome video!!

[@samikaziable]

My science teacher Mrs. Ellis said this is her favorite video and she watches it everyday

[@STUCKINTH3SYSTEM]

This makes all the sense in the universe!

[@TheJennRogue]

1:20 great

[@denasewell]

AWESOME!

[@Ackermanmedia]

Everything can be filed down to a wave. Energy waves, light waves and water waves......it's all about the waves.

[@fixedguitar47]

Spot on 100% accurate. Well said!

[@marcosantonioattie6364]

lindo e perfeito

[@AzriRich88]

That's how all the planet is moving around the sun, dancing.😊

[@chris06095]

I'm just curious about the kind of person who down-votes a video such as this.

[@prettybabyinpink]

chris06095 same! Right, lol, who dislikes this?

[@stephenwedderburn9307]

This just popped up and I'm glad it was so cool 😎

[@elizabethwest5949]

I’d be the one to trip into the thing and get the crap beaten out of me by bowling balls

[@rockofullr]

Lolol Awesome science experiment. Until the last second when "god" suddenly appears in the science classroom.

[@KS-xx5xq]

Most. Satisfying. Vid. Ever.

[@jamma246]

I like the sound of the chimes, but can't help but feel that the whole thing would be way more accurate, and therefore even better visually, without them. Still, awesome device; nice to see kid's being inquisitive about physics (although unfortunately the same can't be said about the God-bothering parents...).

[@barbiekat9764]

Are the chimes added or are they a attached to the project?

[@jujjuj7676]

This is also amazing demostration of how you can nurish 1000 mosquitos in the quickest time. Nice job..😂

[@marknewman3712]

They came so close to making this a learning experience--then the woman contaminated it with a comment about god.

[@ssjgogetta]

You came close to making an intelligent contribution - then your comment would be proof of a miracle.

[@marknewman3712]

I take that as a compliment.

[@goldengoat1737]

@@marknewman3712 clearly you don’t know much about Physics… To dismiss The idea of god is actually laughable if you know much about how the universe works

[@ariahblack6043]

Right !! lol poor kids

[@ariahblack6043]

@@goldengoat1737you need education . There are no provable gods as of 2024 lol

[@RayPublicHealth]

Thank you for posting and for your wonderful post explaining it and including links. :-)

[@justmehere34]

Hopefully the lady at the end didn't ruin any future Physicists with her "God" talk. Made me cringe.

[@TheGentlemanPhysicis]

This is such a cool demo

[@StacySelah]

ORDER OUT OF CHAOS be still in times of crisis bcuz it will always come back to order

[@Gardenowl]

I love this and am bent on getting a few built in Indy!

[@Nickzilla84]

I was impressed until someone had to ruin it with religion then I quick hit exit.

[@scottiemon9036]

But hell is real and there is no exit...

[@Nickzilla84]

@@scottiemon9036 and we're in it now correct

[@scottiemon9036]

kzbin.info/www/bejne/mpOVda1-gbqZrcU

[@chrisbarrington798]

I was waiting for someone to run through the dam thing 😂

[@ShikamaruXT]

These kids are never going to forget this day. And some might even learn a physics Job later.

[@musicfreaksmith5817]

Physics is so awesome!!! God has nothing to do with it

[@TheMysteriisfrog]

fucking moron

[@01prangano]

dude in theory god created everything so..

[@TraceurGonzo]

This is so relaxing to watch =) It will never work 100%,especially since you have them contacting objects (although barely), though this very contact is enough to throw off the whole flow. I do like the noise from the contact though, it allows you to both here and see the general patterns it forms. Great Video!

[@rockerseven]

using science and math and a brilliant demonstration to try and prove god...how pathetic. i feel bad for these kids having to be fed that garbage. they see an outstanding science demo, and the woman starts to discuss the science and math behind it, only to say it's all because of god.

[@christophermartin7098]

I am reminded of harmonies separated by octaves

[@madoldbatwoman]

Amazing thing to do outdoors with kids! Just fantastic. I love all the Oooohhhs and Ahhhhs!

[@tomadams928]

The entire history of the Universe and its cycles in this wonderful short experiment

[@thomaskerley1388]

Now that is a field trip those kids will remember.

[@pyb.5672]

You’re not exploring how the world works, but how your mind works.

[@NudePostingConspiracyTheories]

He-ey !!

[@utubesux1]

Best illustration of life I have ever seen. I'm 54

[@andrewjenery1783]

I almost got myself hypnotised watching this

[@burnsy96]

Now kids, you must run through this without getting hit by the bowling balls or you're not getting back on the bus!

[@sandraross4905]

So cool! Thanks for sharing! :)

[@cameddy4081]

Very well built !! Giant -so cool 💫👏👏👏

[@Karstings]

Am I the only one that’s waiting for one of the kids to start running in an attempt to make it to the other side while dodging every single ball only to get hit and get absolutely flung into oblivion?

[@bonniejanson8662]

I LOVE this!!! Gotta share!

[@jorgefernandez9310]

That is cool!

[@paulhammons7077]

Gravity and motivation. Beautiful.. 😊

[@deborahlawrence8086]

Awesome

[@influxoftux]

these kids are alot more patient than i woulda been lol

[@iCUVideos2011]

Please post one where you let it finish. Or does it not come to a complete rest?

[@G.W.Harrison]

More please and thank you..

[@readthetype]

LSD? Check. Bowling ball pendulum? Check. I know what _I’m_ doing for the next 12h.

[@CatherineSTodd]

How long does the wave last, or does it last forever? Fascinating! I need to learn physics!

[@JayKnight]

They lose energy over time. Each swing reaches a slightly lower height than the one before, so it will eventually stop.

[@mjanes2552]

till it stops

[@OrangeDrink]

It's interesting, the wave form changes like music notes, if contraption was 10x longer I bet the disorganized moments would show larger numerous wave forms.

[@vitalyplotkin555]

So, what does it demonstrate?

[@hynsum]

It demonstrate that they're governt by laws of Nature...motion, gravity, dynamic, math, physics and whatnot... There was NOT a single moment of chaos even it may appear so... Is nature ever in chaos? Does laws of nature ever create or allow chaos if laws of nature are unchangeable? Also un-bribable and un-cancelable. Unlike "laws" of men....!? So to me lawmaker is ONLY God/Nature. And what men makes is edicts, commands, orders, wishes.... Wouldn't you agree?

[@rebeccaj210]

Did that lady mention god in the end? LOL. What the fuck.

[@maxharasen6548]

yes. she did. and she did so in a way that supports science. despite what many people here think.

[@maxharasen6548]

***** ??? she never said that the laws of physics don't apply. she, and the kids there, simply believe that God created the universe. If God created the universe then he also set up those laws.

[@DeezelxDr3amz]

Doesnt this happen because the balls are different weights and swing at different inertia forces? Or is it because the balls are hitting differently shaped or sized sounding charms? Lol so rad

[@ALBINO1D]

I love how humans will gather and stare in expectation together. Just staring.

[@TigerDan925]

Wow that was amazing. Bet it took ages to configure. awesome results though

[@tylersnidow8752]

beautiful physics.

[@katballoo59]

I love this! As a homeschooler, where could I find a lesson or unit that goes with this?

[@killerjg]

So that's why Neptune takes so long to make an orbit.

[@Leobu8hv]

I loved it . What's the origin of sound

[@Raging.Geekazoid]

A: Not a wave. B: It's a relationship, not an interaction.

[@lamaamal8998]

2:10 "more slowly"? im german, so i am not sure, but wouldnt it be "slower" ?

[@vvi95a]

eh either way

[@FredHicks]

A noun might be slower but it goes more slowly. Adjective (slower) applies to noun, adverb (slowly) applies to verb.

[@jaynekucharski8500]

hello, i really want to come visit this. i know it says it is not open to the public but can someone please direct to me where i could visit one of these in person if its not this one. what a shame they do not open this to the public.. to share this beauty with those interested. thank you