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!
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.
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!
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.
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.
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.
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.
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.
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)
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.
@@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.
@@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.
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..
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.
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.
@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.
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!
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
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!
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?
Top beam is forced into a waveform flex by the weight of the initial force... Thereafter the waveform forms in the objects below and the rest is just momentum conservation.
period for suitably small angle is 2*PI*sqrt( l / g). Not sure how a non rigid pendulum would work, but different supporting string/cable lengths is all you need for different periods - mass does not matter
Michael Bauers One question I did have was the bells. They seem to work via contact with the "pendulums" which is another variable - wondering how they minimized the slow down due to this. Of course wind would also mess up the pattern if it was slowing down some, and speeding up others.
+Michael Bauers If you look, you can see some metal pieces attached to the bottom of the bowling balls. It wouldn't take a very large force to make the chime ring, and if you attached them to the bowling balls via something that had give to it, it wouldn't really leech away much momentum from the swing.
Air drag or wind drag. If this was in controlled enclosed area of a wind tunnel test you would see the only 2 balls at opposite ends started out with 1 side dragging air while the rest riding momentum of both sides less drag resulting in these motions done out of the rhythm of the air drag. Im just wondering if the hang hooks all aligned straight up top of across.
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.
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
One fascinating observation. If you look and listen closely to the tempo of the pendulums, there is only (1) that is the lead (the one closest to the bottom of the screen). After observing that, it almost seems as if all of the others are working to sync in tune with each other, and then fall out of sync, almost to fall back in order again, etc… What drives the (1) ball to be the leader, and not (2) at the same time in syncopation?
I see what you mean. Comment reply took an entire year huh lol. It might be the volume and closeness to camera mic as well. So not only volume but there are subtle differences in reverb etc. I totally see what you mean though
The best way to study the physics behind this contraption is to have each kid run through it infividually. The kids that make it to the other side without getting knocked unconscious will have a proper understanding of the laws of motion. The kids that don't make through will understand how the concept of force works! I call it a hands on approach to learning.
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
At the point where the balls appear to be completely out of sync, you would think there is complete randomness at play. But over time they come together again to show that there is actually an underlying pattern. What if this is our time alive? Only able to see complete randomness, not yet able to see that there is order in the apparent chaos.
Help me find something, I found a website that had a similar demonstration but it was with dots traveling round a centre point that made a chime going past one line spinning round. Anyone know what thats called?
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
This is a cool video that demonstrates gravitational forces and pendulum length and period. I don't know why they threw in these chimes and not sure they are real. The chimes are over kill and if real also would affect the balls' frequency. If you notice, the chimes do not move at all. Not sure that is solid engineering or CGI. That detail makes me wonder if any of the video is real. And the mass of the balls in close proximity will have an influence on the motion. That can be demonstrated by leaving one ball stationary and swinging a ball immediately next to it. The stationary ball will begin to move in synch with the ball in motion.
If there is some transmission of energy through the top plank, then there is coupling and we have coupled oscillators. Some of the synchrony would be due to phase locking dynamics, would it not? Or do the length disparities overcome any influence from mode-locking synchrony dynamics? Surprising there is not in fact more integer mode-locking such as 1:2 and 2:3 which remain locked forever. If they are connected at the top board through vibration they should mode lock into Farey sequence fractions. Why not? ruclips.net/video/5v5eBf2KwF8/видео.html
I have been thinking about some of this stuff myself so forgive me for commenting on your comment. But here's my interpretation. I would guess that in this very short amount of time, there wouldn't be that much coupling between the individual oscillators (the individual bowling balls), and that the global effects you see is a function only of the way the video's author (and the kids) have established the lengths of each of the strings. If you look at any two adjacent balls, you won't see any mode-locking (or it would be very high order), but if you looked at nonadjacent balls you might see some APPARENT mode-locking -- but I would guess they're not exchanging enough energy with one another across these nonadjacent distances to actually "lock." Same with phase-locking. But I'm actually not an expert in this - just fascinated with it and I love the video. Curious for anyone else's thoughts on this.
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!
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.
“Sing”?
Except for the coughing. :(
@@owenbartrop8963 Would be better without physical contact, using a light beam to trigger sounds.
You have not been around long.
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!
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.
No, you never are! Keep looking and learning.
@@bobh6728
Teachers are a special breed, they make all the difference in learning...
@@bobh6728
I haven't done the research yet, but what you say sounds very plausible!
@@fredgervinm.p.3315But most only teach what they are told too unfortunately
This is the sort of stuff RUclips should be for.
I don't know. I think breaking my brain once is enough for one day.
It used to be
Yeah this and fart videos
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.
He is ONE AWESOME teacher - a true educator!!!!! I loved his classes and his hands-on approach.,
Except, theyre saying that its God doing this...
No, its physics.
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.
@@TheHunted385 And we have physics because of....
You're sooo close to getting it.
@@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.
The polyrhythms this creates are absolutely beautiful, music in a pure form
Simply amazing. This reminds me the importance of experiment and see the real thing working, not just computers simulation
Oh no people are growing up and seeing things on a screen before they see it for real 😨😰🤕
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.
It's amazing to think how far we have come with science and yet such a simple thing is so mesmerizing and beautiful.
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.
Vacuum bell?
Boiling at room temperature? Do you mean evaporation?
Water in the vacuum chamber did it for me too, alarm clock in the vacuum chamber was another good one.
A mathematician can explain this....😳
@@enekaitzteixeira7010No, it would be boiling.
That's pretty awesome to see there's so many different patterns in a simple wave...
I love the incorporation of sound to the visuals of the wave!❤
I. am 73. I never saw this before. Fascinating!
There's much better examples of it. This one was pretty crude.
Конечно не видел. Раньше не было ютуба
We are all the same age on the Internet, because of it
10/10
Thank you for all that information in the description! that vote was well deserved
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)
That hurts my brain just reading it
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.
@@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.
@@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.
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..
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.
ruclips.net/video/zAxT0mRGuoY/видео.html
Well formulated. I tried to say the same thing, no success.
Oh... I thought the universe happened by random accident!!!!!
Pretentious chav.
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.
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.
Try explaining your way to a child lol
@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.
im not a very science person but this was very interesting and made me want to learn more....loved it
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!
Wonderful pendulums is so fascinating. Great artwork! Congratulations on a great video too!.
As a Youth Bowler myself, this is very creative. Great job !
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.
I could watch and listen to that for hours on end!
YES! Thank you for this awesome demo!
Very well done! Fantastic visual explanation!
Physics is so cool. And building big examples of complex physical principles, in your backyard, is just plain awesome!
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
And then the teacher said; "now kids we have the obstacle course ready" - first one through get's a free dinner!
I thought it was an obstacle course too, looking at the thumbnail.
😂
Class buffoon:
-¡Leeeeeroy Jjjjjjjjenkiiiiiiins! Muah-hahaha!
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!
One of the best videos on RUclips
I love this and am bent on getting a few built in Indy!
I love how this brought out such enthusiasm from the kids! Yay teachers :)
Bravo! Clap, Clap!!! Very intriguing... Loved it. Thanks for the awesome video!!
Шикарно! Я смотрел затаив дыхание! Очень показательно и доходчиво! Спасибо!!
2:10 "more slowly"? im german, so i am not sure, but wouldnt it be "slower" ?
eh either way
A noun might be slower but it goes more slowly. Adjective (slower) applies to noun, adverb (slowly) applies to verb.
Классное видео!
Физика!
I am reminded of harmonies separated by octaves
This makes all the sense in the universe!
Everything can be filed down to a wave. Energy waves, light waves and water waves......it's all about the waves.
Spot on 100% accurate. Well said!
I hope that kid survived whooping cough.
I think he hacked up part of his lung watching this demonstration. Lol
I feel so horrible for laughing as hard as I did at this comment.
Thought it was the vid
It's AIDS. Believe me, I would know.
poor child. he sounded really ill. i hope no one else came down with whatever he had.
So, what does it demonstrate?
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?
This is such a cool demo
They’ve got some balls showing this
Some big brass balls
Top class observation!!!
Top beam is forced into a waveform flex by the weight of the initial force... Thereafter the waveform forms in the objects below and the rest is just momentum conservation.
I was almost asleep until 2:53
period for suitably small angle is 2*PI*sqrt( l / g). Not sure how a non rigid pendulum would work, but different supporting string/cable lengths is all you need for different periods - mass does not matter
Michael Bauers One question I did have was the bells. They seem to work via contact with the "pendulums" which is another variable - wondering how they minimized the slow down due to this. Of course wind would also mess up the pattern if it was slowing down some, and speeding up others.
+Michael Bauers If you look, you can see some metal pieces attached to the bottom of the bowling balls. It wouldn't take a very large force to make the chime ring, and if you attached them to the bowling balls via something that had give to it, it wouldn't really leech away much momentum from the swing.
Air drag or wind drag. If this was in controlled enclosed area of a wind tunnel test you would see the only 2 balls at opposite ends started out with 1 side dragging air while the rest riding momentum of both sides less drag resulting in these motions done out of the rhythm of the air drag. Im just wondering if the hang hooks all aligned straight up top of across.
Most. Satisfying. Vid. Ever.
The entire history of the Universe and its cycles in this wonderful short experiment
I’d be the one to trip into the thing and get the crap beaten out of me by bowling balls
These kids are never going to forget this day.
And some might even learn a physics Job later.
Thank you for posting and for your wonderful post explaining it and including links. :-)
Amazing thing to do outdoors with kids! Just fantastic. I love all the Oooohhhs and Ahhhhs!
Someone get that damn kid with a cough some Robitussin.
Yeah after the VID I still look at a coughing person like they are a serial killer
Summer camp gauntlets have come a long way
I'm not sure how you didn't get more likes. I'm still chuckling over here.
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.
And Kids asked their teacher: "Why is this happening, how does it work?" He replied "I have no idea, but this is awesome, right?"
Lol 😆
Because time of pendulum depends on length of pendulum
Longer needs long time 🤠
It's because the string that's holding each mass is shorter/longer
'Homeschooled?'
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
One fascinating observation. If you look and listen closely to the tempo of the pendulums, there is only (1) that is the lead (the one closest to the bottom of the screen). After observing that, it almost seems as if all of the others are working to sync in tune with each other, and then fall out of sync, almost to fall back in order again, etc… What drives the (1) ball to be the leader, and not (2) at the same time in syncopation?
I see what you mean. Comment reply took an entire year huh lol. It might be the volume and closeness to camera mic as well. So not only volume but there are subtle differences in reverb etc. I totally see what you mean though
This just popped up and I'm glad it was so cool 😎
I noticed that you cannot see the attachment point.
the mass of the ball does matter or else these which all have the same length rope would move the same.
What is that super annoying wind chime?
My question is,
Do all the bowling balls weigh the same and or does it matter
if you drop a 2kg ball from 1 meter and a 10 kg ball from 1 meter they will take the same time to hit the ground.. this is different lenghts
The best way to study the physics behind this contraption is to have each kid run through it infividually.
The kids that make it to the other side without getting knocked unconscious will have a proper understanding of the laws of motion.
The kids that don't make through will understand how the concept of force works!
I call it a hands on approach to learning.
I’m one of those kids in the Video and It took so much to stop us from constantly being in the Swing zone lol
Gravity and motivation. Beautiful.. 😊
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
I almost got myself hypnotised watching this
die wellenlenge verkurzt sich, also die freqenz erhoht sich. aber warum? sendungmitdermaus?
More please and thank you..
Very well built !! Giant -so cool 💫👏👏👏
three minutes of staring ... wow. #physics
Thank you!
How does touching the copper pipes not significantly slow down the swing of the bowling balls? what makes the connection?
That's how all the planet is moving around the sun, dancing.😊
So why not have different material bases on your pipes
This is also amazing demostration of how you can nurish 1000 mosquitos in the quickest time. Nice job..😂
He was my professor last year! Awesome awesome guy who makes some super cool stuff and is a super cool teacher! haha
+Grayson Nolen What's his name and how do I contact him?
+David Michael His name is Jeff Goodman and his email is goodmanjm@appstate.edu.
Now that is a field trip those kids will remember.
At the point where the balls appear to be completely out of sync, you would think there is complete randomness at play. But over time they come together again to show that there is actually an underlying pattern. What if this is our time alive? Only able to see complete randomness, not yet able to see that there is order in the apparent chaos.
beautiful physics.
It's some kind of relaxing watching this.
My science teacher Mrs. Ellis said this is her favorite video and she watches it everyday
So cool! Thanks for sharing! :)
Help me find something, I found a website that had a similar demonstration but it was with dots traveling round a centre point that made a chime going past one line spinning round. Anyone know what thats called?
Aren't the balls also different weights?
Everyone should watch this at least once in their life
Best illustration of life I have ever seen. I'm 54
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
Paint the balls white for better clarity and effect.
The explosion at the end was the best
That is cool!
I LOVE this!!! Gotta share!
I loved it . What's the origin of sound
This is a cool video that demonstrates gravitational forces and pendulum length and period. I don't know why they threw in these chimes and not sure they are real. The chimes are over kill and if real also would affect the balls' frequency. If you notice, the chimes do not move at all. Not sure that is solid engineering or CGI. That detail makes me wonder if any of the video is real. And the mass of the balls in close proximity will have an influence on the motion. That can be demonstrated by leaving one ball stationary and swinging a ball immediately next to it. The stationary ball will begin to move in synch with the ball in motion.
How long does the wave last, or does it last forever? Fascinating! I need to learn physics!
They lose energy over time. Each swing reaches a slightly lower height than the one before, so it will eventually stop.
till it stops
Could you run the length of a pendulum wave to escape your captors, and if so, when would you run?
Please post one where you let it finish. Or does it not come to a complete rest?
Are you guys okay up there?
If there is some transmission of energy through the top plank, then there is coupling and we have coupled oscillators. Some of the synchrony would be due to phase locking dynamics, would it not? Or do the length disparities overcome any influence from mode-locking synchrony dynamics? Surprising there is not in fact more integer mode-locking such as 1:2 and 2:3 which remain locked forever. If they are connected at the top board through vibration they should mode lock into Farey sequence fractions. Why not?
ruclips.net/video/5v5eBf2KwF8/видео.html
I have been thinking about some of this stuff myself so forgive me for commenting on your comment. But here's my interpretation. I would guess that in this very short amount of time, there wouldn't be that much coupling between the individual oscillators (the individual bowling balls), and that the global effects you see is a function only of the way the video's author (and the kids) have established the lengths of each of the strings. If you look at any two adjacent balls, you won't see any mode-locking (or it would be very high order), but if you looked at nonadjacent balls you might see some APPARENT mode-locking -- but I would guess they're not exchanging enough energy with one another across these nonadjacent distances to actually "lock." Same with phase-locking. But I'm actually not an expert in this - just fascinated with it and I love the video. Curious for anyone else's thoughts on this.
Awesome
it's a really large, really complicated polyrhythm!