Pendulum Wave Demonstration
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- Опубліковано 29 вер 2024
- This is a large-scale demonstration of the interaction between period and pendulum length, using 16 bowling balls hung from a wooden frame.
Here are answers to some common questions:
** What am I seeing? How does this work? **
The length of time it takes a ball to swing back and forth one time to return to its starting position is dependent on the length of the pendulum, not the mass of the ball. A longer pendulum will take longer to complete one cycle than a shorter pendulum. The lengths of the pendula in this demonstration are all different and were calculated so that in about 2:40, the balls all return to the same position at the same time - in that 2:40, the longest pendulum (in front) will oscillate (or go back and forth) 50 times, the next will oscillate 51 times, and on to the last of the 16 pendula which will oscillate 65 times. Try counting how many times the ball in front swings back and forth in the time it takes the balls to line up again, and then count how many times the ball in back swings back and forth in the same time (though it's much harder to keep your eye on the ball in back!)
** Who made this? **
This was made by Jeff Goodman, who teaches at Appalachian State University in Boone, NC. Jeff has some more information and videos about the making of this pendulum wave at celophoto.blogs...
** Why are they not perfect at the end? **
This large frame is built from wood and is outdoors, which means it expands, contracts, and flexes. Because the position of the frame changes, the cycle lengths are not perfectly aligned. Variable energy loss due to air friction and the striking of the pipe at the bottom (which creates the music) also contribute to differences. Over time, the minor differences become more pronounced.
** Can I get a copy of this video to use in my classroom? **
You are encouraged to use this video for educational purposes! If you are sharing online, please link back to this video. Contact me if you want to use it in other ways or if you need a higher-quality version. This video is available under Creative Commons license BY-SA: creativecommons...
** How can I make my own? Where can I learn more? **
Here are some links to information about the physics behind this. I don’t have the plans for it, but work through the information at these links and design your own - you’ll learn a lot about physics, math, and construction!
-- www.arborsci.co...
-- Harvard demo page: bit.ly/1qJkBr2
-- AJP paper: bit.ly/1xOcYUO
-- • Mount Shasta High Scho...
** Where is this? **
It was built on private property in the mountains of North Carolina (United States), near Burnsville. It is not open to the public. However, Jeff Goodman and I recommend some places near this that work to make the magic of the natural world a part of everyday life. The joy and wonder in our world that these places foster is exactly what drives the creation of amazing things like this pendulum wave!
-- For all the kids in your life, check out Camp Celo: campcelo.com
This is a farm-home camp for kids 7-12 (and older kids can work there!). It’s a wonderful place for kids to experience the natural world with independence and joy. No electronic entertainment, just the home-grown variety like this pendulum wave. If you don’t have kids to send there, make a donation to Friends of Camp Celo (friendsofcampce...) to help send a child to camp who otherwise wouldn’t be able to go. (I am on the Board of this all-volunteer nonprofit and this video was taken at one of their events.)
-- Right next door is the Arthur Morgan School (AMS): arthurmorgansch...
AMS is a progressive boarding and day school for 7th, 8th, and 9th graders, located on 100 acres of farm and wilderness. At AMS, students learn to question, evaluate, think creatively and work cooperatively.
**If you've read this far, will you do me a favor?**
Go to this link and vote for JJ to be the 2014 American Hero Dog: www.herodogawar...
JJ is a very special little dog who protects a very special little girl named KK's life by doing something just as magical as what you see in this video: JJ uses her nose to detect when KK is having a potentially life-threatening reaction, before any medical equipment can detect it. Her doctors think JJ is so good that they invited her into surgery at Duke Medical Center last December! You can learn more at eenp.org/main/K.... The contest ends on 9/15 and you can vote every day. If you like KK’s & JJ's page, you get a daily picture and reminder: AngelPaws....
Thanks!
This is the sort of stuff UA-cam 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
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!
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
Did you ever wonder why you got into “the Corp” so easily?( no disrespect guys…joke).😂
We are all the same age on the Internet, because of it
YES! Thank you for this awesome demo!
these kids are alot more patient than i woulda been lol
beautiful physics.
Now kids, you must run through this without getting hit by the bowling balls or you're not getting back on the bus!
Awesome
imagine our planets be doing this
Hail Science !
+Joseph L Hall I'm Sciencing as fast as I can!
very cool
I think this is the most beautiful thing that I have ever seen...
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
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
Maybe read the video description? He knows exactly.
It’s magic Timmy, shut up n watch the friggin’ balls 😂
Simply amazing. This reminds me the importance of experiment and see the real thing working, not just computers simulation
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.
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.
three minutes of staring ... wow. #physics
Thank you!
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 .
If God is all then how could it had not been God? duh. lol
Zarah McIntosh "God" isn't all, that's how. Fairy tails are for children.
Shane Oshea lol then it means we all have different definitions for "God".
Zarah McIntosh And most likely they're all wrong.
Vigilant Pigeon I know I'm not wrong :) and there's nothing anyone else can do about it.
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.
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
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.
im not a very science person but this was very interesting and made me want to learn more....loved it
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.
ua-cam.com/video/zAxT0mRGuoY/v-deo.html
Well formulated. I tried to say the same thing, no success.
Oh... I thought the universe happened by random accident!!!!!
Pretentious chav.
The polyrhythms this creates are absolutely beautiful, music in a pure form
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
That's pretty awesome to see there's so many different patterns in a simple wave...
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..
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.
These kids are never going to forget this day.
And some might even learn a physics Job later.
I was almost asleep until 2:53
I love the incorporation of sound to the visuals of the wave!❤
10/10
Thank you for all that information in the description! that vote was well deserved
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.
If we ever want to catch up in STEM we need more teachers presenting kids science in an amenable manner like this.
That's how all the planet is moving around the sun, dancing.😊
This is also amazing demostration of how you can nurish 1000 mosquitos in the quickest time. Nice job..😂
Wonderful pendulums is so fascinating. Great artwork! Congratulations on a great video too!.
I was impressed until someone had to ruin it with religion then I quick hit exit.
But hell is real and there is no exit...
@@scottiemon9036 and we're in it now correct
ua-cam.com/video/db2DzHLUfwc/v-deo.html
Wow that was amazing. Bet it took ages to configure. awesome results though
This is the wokeness that terrifies Republicans...education. 🤦🏻♂️
was gunna ask if this was one family but its definitely church camp....
I love how this brought out such enthusiasm from the kids! Yay teachers :)
Классное видео!
Физика!
God made an ordered structure to our universe. It's more amazing the more you learn.
I'm just curious about the kind of person who down-votes a video such as this.
chris06095 same! Right, lol, who dislikes this?
Amazing thing to do outdoors with kids! Just fantastic. I love all the Oooohhhs and Ahhhhs!
You’re not exploring how the world works, but how your mind works.
He-ey !!
Bravo! Clap, Clap!!! Very intriguing... Loved it. Thanks for the awesome video!!
Longest 2 minutes and 58 seconds of my life lmao
Nice one! The size of it takes it from impressive to magical. I built one too, well a few but only have one video. It's not a great video but it's a pretty good demonstration, along with other forms of harmonic systems. You should check it out.
this video was awesome until the end where she started evangelizing based on science which is a new one for me
At the risk of sounding blasphemous. The universe was created in six days: it is said that God rested on the 7th day… but that’s another story.
Anyway;
What some people “conveniently” forget to mention:
the design process took something like billions of years.
That’s why rocks are hard, but only when you pick them up to cast stones upon your neighbors. Otherwise rocks are like nerf balls (when not being used for religious based homicide).
PS: My comment above is satire.
🗽💯🗳️💙🇺🇸🤟🏽🌿✌🏽
I am reminded of harmonies separated by octaves
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.
Grown kids. Explained in form of visual effect. I with to hear explanations
Thank you for posting and for your wonderful post explaining it and including links. :-)
Love this! Makes me miss our place up there in those mountains! Great folks up there!
This makes all the sense in the universe!
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
Brought to you by TUoD - The University of Duh.
They’ve got some balls showing this
Some big brass balls
Top class observation!!!
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?
ua-cam.com/video/5v5eBf2KwF8/v-deo.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.
Very well done! Fantastic visual explanation!
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!
I was waiting for someone to run through the dam thing 😂
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.
Reminds me of when I was at high school and I had to run through the gauntlet of older boys bashing me.......the "science" of coming of age
if one believes in God than yeah everything came from God. that's okay and I'm starting to prefer God loving people to planet wasting atheists. I'm okay with God
Atheistic extremism looks like a youtube comment section
Religious extremism looks like a genocide
The difference between Atheistic extremism and Religious extremism is that Atheistic extremism is FREEDOM FROM RELIGION.
“Many religions now come before us with ingratiating smirks and outspread hands, like an unctuous merchant in a bazaar. They offer consolation and solidarity and uplift, competing as they do in a marketplace. But we have a right to remember how barbarically they behaved when they were strong and were making an offer that people could not refuse.”
-Christopher Hitchens-
@@classyassmothafucka8890Hopefully in the 5 years since you wrote this you realized that atheist extremism is truly a genocidal mindset. To be an extremist atheist means to blindly lie to yourself that you or anyone else can somehow have the answers to everything. Look how atheism has eroded our culture, our trust in one another, it has robbed the world of love. No one is principled and peoples faith has been focused towards a false prophet known as The Science. To blindly follow brings destruction, which the teachings of Christ warn about.
What is that super annoying wind chime?
Seriously no wonder chineese kids are smarter.
As a Youth Bowler myself, this is very creative. Great job !
In my opinion this would be a lot better if there weren't all those pipes making noise :P
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
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.
Most. Satisfying. Vid. Ever.
This is a very cool clip - sent to me by Robin Tim So our beloved celebrity acupuncturist at the NeuroPhysics Training and Rehabilitation Institute.
The unpredictable nonlinear dynamics of the balls in the video, which were all set off at once, is analogous to behaviour in many systems. The individual agents in a dynamical system are 'sensitively dependant on initial conditions' as is the system as a whole. Very tiny influences from one agent to the next, can have a very significant effect on the behaviour of the system as a whole - often referred to as 'the butterfly effect'.
Your body for example, is a non-equilibrium, nonlinear dynamical system comprised of trillions of individual agents (cells) - all of which are sensitive dependant on some initial conditions - where tiny influences; lets say that 'Botox injection' that seemingly only had an effect on the behaviour of a small population of cells, can over time (as demonstrated) have a very significant effect on the behaviour of the system as a whole. Take home message - "EVERY" fluctuation in biology "Matters". You will note in the video how the balls move to and fro from randomness into orderliness without intervention. Regardless of what path they take though, the attractor is the pendulous stable point of rest for every ball. The balls go from unstable equilibrium (the starting position) - to stable equilibrium (their resting point). When our bodies eventually arrive at stable equilibrium, unfortunately we are dead.
I think these oscillators are uncoupled, however. I don't think there's a butterfly effect in that sense: each one is doing its own thing, and it is because of the way that the author (and the kids!) have constructed the patterns of lengths across successive balls that a meta-pattern emerges. I'm curious what the author of the video has to say about this because I'm not an expert.
Teacher: Okay Billy.. you’re up. Run as fast as you can through it without stopping.. don’t let me down.
Billy: But Mr. Anderson, I could get hurt..
Teacher: Billy… I will literally _END YOU_ if you don’t run through my course right this damn second..
Billy: 👁️👄👁️
Hopefully the lady at the end didn't ruin any future Physicists with her "God" talk. Made me cringe.
DUDE! Put this on Loop at 0.25 speed and turn up the volume! It's like the Aliens are talking in the background while their ceremonial musical instrument chimes in their Alien King, Torvethuzella XVIII, who comes to greet we humans with peace and understanding.
Now imagine if each one of the pendulum balls had laser beams streaming out every time they passed a chime-tube, and it was at night, and the wires holding them were painted with fluoroluminescent paint.
Yeah...
この大きいサイズは良いね👍✨
Very good for children to see as long as the instructor doesn’t say it is due to the spin of the earth… earth is unequivocally an intelligently created enclosed stationary plane not a spinning space rock in a soul lure system… Peace
I could watch and listen to that for hours on end!
Always the same patterns and same conclusions unless disrupted or friction or function has changed endless possibilities, but if left, the same patterns exist singular or together.
Much like our planet and how we move on it or share the space within it.
Outside of our planet and around our planet. We are all connected and have our own momentum trying to change that or throw it off of balance could be detrimental.
That would change the course and cause for concern and have the same altered results.
Bumping or swaying out of control ends up out of tune and can distrupt or bring everything to a halt or cause chaos and, in turn, would be considered out of control and lose its meaning and purpose.
These are very humbling and very gentle reminders that we should be more aware of our movement.
It affects everything in us and around us.
Cause and Affect.
Nurture Nature.
Self love Give love.
Find Peace Create Peace.
One With God Our Creator.
Late to the party, but troubled by people who are offended by the comment at the end.
If you take a broad perspective and include the Buddhist idea of God as "all that exists",
this comment should not trouble you.
The conflict between science and religion is a new thing. Most of the great science done in the past was by "religious" scholars trying to parse the Universe. Look at Newton, Galileo, Copernicus, Kepler, Descartes, Mendel, Planck and Einstein. Einstein invoked "Spinoza's God who reveals himself in the harmony of what exists." and, "Science without religion is lame, religion without science is blind."
Science is about cosmic order. Religion is about cosmic purpose.
Let us be united, not divided on this big blue marble.
Did that lady mention god in the end? LOL. What the fuck.
yes. she did.
and she did so in a way that supports science.
despite what many people here think.
***** ??? 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.
That is cool!
Wow incredible so all released with the same PE and I assume each ball has the same mass but yet they all take a different flight path
Even saw the DNA 🧬 shape form
The only way to explain this is the movement creates and energy field that interacts with existing field around us
Because logically you would expect every single ball to swing back and forth in the exact same flight path
There is also the pendulum resonance effect which kind of contradicts what’s happening here ❤
LSD? Check. Bowling ball pendulum? Check. I know what _I’m_ doing for the next 12h.
Paint the balls white for better clarity and effect.
I had a neighbor (he was a high school Chemistry teacher) built a set of these. Everything has to be correct. I know that sounds obvious, but you screw anything up and you won't get the desired optical lessons.
Science is so fucking awesome
They’re still trying to figure out why the crew from the “Philadelphia experiment “ keep showing up on different dates!✅
They’re still trying to figure out why the crew from the “Philadelphia experiment “ keep showing up on different dates!✅
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...).
Are the chimes added or are they a attached to the project?
She's just saying God made these rules why is that so hard for some skeptics to believe? I mean did the laws of nature just get determined arbitrarily? It makes sense an all powerful being determined the rules of this universe, so why does the mere mention of God trigger so many skeptics? Such immature skepticism, low level thinking
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.
At about 15 seconds:
"Okay. I'm definitely in the Matrix."
Now tell me physics is dull😂. Pendulum theory and beat-frequency all in one demo. Brilliant.
Too bad this is taken into the context of "god" (comment from woman at the end). But important none the less and humongous kudos to "religious believers" to teach basic empiric physics and science.