Angular Momentum - Science Theater 24
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- čas přidán 27. 08. 2024
- Ice skaters spin faster by hugging themselves tight, but what does that have to do with riding a bicycle? In both cases, the law of conservation of angular momentum is in effect. Watch a few more angular momentum examples!
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The example after 03:46 is the best demonstration of angular momentum, I think.
Amazing..also you explained in the way Sheldon Cooper explains
LOL even I see young sheldon
4 years i spent to study and calculate angular momentum without knowing the real application.. Only Now i get the idea.. Sighh
i know it's pretty randomly asking but do anyone know a good website to watch newly released series online?
Thats lack of imagination my friend
sir pls don't stop continue .u r doing wonderful job thank u
@scjtraveler I believe the main problem is that somehow I obtained a small bit of angular momentum in one direction. Tilt the wheel one direction and it counteracts that small momentum, tilt it in the other direction and the wheel (and my leftover momentum) combine to make me spin that direction. I'm sure there is some friction slowing down the process but if that were it, I wouldn't spin in either direction.
phenomenal video. Extremely helpful. I have a much better intuition of angular momentum now. Thank you.
Your demonstration is excellent!! Thank you! :)
What's the amazing explanation
Sir,I'm writing from another country. You have made the concept easy to me.Thanks a lot.
LOOK AT THEM SHOES AHAHAH!!
Nice video!
I noticed when doing this experiment the initial orientation of the bicycle wheel when you spin it determines whether or not you can turn both directions on the platform. Make sure the wheel is perpendicular to the ground when you spin it and then you should be able to go both direction on the platform depending on how you tilt the wheel.
Somebody needs to try it. I want to see it.
This video explanation is hell awesome.
thanks ...that was a very nice video....btw i don't think i even knew what physics is when you posted this video
Your method of teaching makes concepts extremely easy to grasp
What a nice explanation of Momentum!
One of the best explanation I have ever come across.... Awesome
thank you so much .. you made my concept more clear ..
First time in life I understood Angular Momentum
Best video i found about this. Everything is clear now.
@manofaction2828 Many of the items I used in my videos (particularly episodes from the late teens through 30 or so) were borrowed from the Physics Department at Purdue University.
@boumbh I didn't redo it, although I tried a couple "takes" of it that day. I suspect I had a tad bit of momentum when I stepped on and thus only could go "one way"...
i was thinking "wouldn't it be cool if he used a larger ball" and you did!! love your videos!
Thakn u sir really ... from India
I shouldn't have added procession in there, but it's not the spinning wheel that keeps you up. You have to get the wheel spinning pretty fast for any effect to be noticeable. It's the way the handles turn into the fall (not from the gyro) that keeps the wheels under the center of gravity. That is why a bike going very slowly can stay up on it's own. I'm not saying the effect isn't there, but it may as well not be.
You should have tried to do the spinning with the bicycle wheel while sitting on the spinning stool, you would be more stable that way and have an easier time reversing directions. My physics teacher did it that way and it worked fine.
Nice video. I loved the ending where the wheel wouldn't spin in the other direction. ;)
Professor, I hope you're still alive (after 12 years) and you will read this. I would like to explain why you are NOT turning backwards as you wrongly expected.
When you got up on the chair you already had some amount of angular momentum (in the spinning wheel) in the rest reference of the chair, so your angular momentum is zero (yours=0, chair=0, wheel=+W). When you fliped the wheel you changed the angular momentum of the wheel (from lets say +W to -W) so the system (chair, you, wheel) must modify the individual angular momentums to compensate the change you made (by flipping).
BUT! once you flip back the wheel you come back to the initial angular momentum configuration : chair at rest, you at rest, wheel spinning (with angular momentum +W).
Still alive and kicking! My hope was to get on with zero angular momentum on the wheel so I could tilt it one way and rotate that direction, center it to stop, then tilt completely the other way.
Thanks for the corrections/explanation!
WHAT ARE THOOOOOSE
Pendulum right??
Thank you Sir ❤
From Bangladesh.
Awesome. Didn't know the thing with bicycle.
So when you see a bicycle tied on the back of a car, and the wheel is spinning, is that angular momentum induced by turning? But what's turning if the car is going straight? I'm thinking coriolis.
@jscook55 depending on how I was pushing on it, rotation like that I -think- would be opposed by my own arms (one would want to go one way the other the other way, and they would end up not moving)
Wow..it's really nice 😃
awesome.....can understand more clearly..
استاذ عمار احسن استاذ
of corse
@@3rbeGamer of course**
You explain stuff in very fun way thank you ✌
Procession doesn't, but the fact that the wheels are spinning does mean it makes it harder for them to tip over... as shown in the video where its harder for me to tip the rotating tire...
I -think- the correct answer is that AS I spin it I cancel out the vertical and turn it into sideways, just like you can turn the front wheel of a bike and make it turn the corner while still preserving its forward motion.
4:13 = reactionless propulsion if we could figure out how
Amazing
I don't get one thing .. I understand that the horizontal spins cancel out
but to begin with there was a vertical spin.. .. shouldn't the vertical spin be conserved too??
so when you make the wheel horizontal.. where has the vertical spin gone?
Wow that's great
Thanks a lot professor.
Excited sir
So how do moons spin backwards violating the law of angular momentum?
U are great
Physics is fun!
NICE
Ehi! This guy has a voice similar to Ralphie's voice, from the Sopranos show!!
Great content btw!! :D
We were having the same problem with the wheel in my physics class
+Alkaline Crimson The friction is a large part; if the closed system is not transferring the momentum easily.
Deserves more subs...
What about the green shoes?
Merci beacoup!
at the ending part, you did not turn the other way as you flip the spinning wheel!
Good catch. The system has quite a bit of friction so it isn't perfect. In this case the angular momentum was enough to stop the rotation but not enough to make it go back the other way.
Thanks you.. very helpful.. keep up the good work
got it...thanks
M*v nice explanation...
If the bicycle wheel was rotating in 0 gravity, would it move in any direction?
Why havent your tried stepping on the platform and asking someone to give you the spinning wheel? Normally it would have worked better. I think the platform might have been spinning slowly when you stepped on it thus the starting amount of angular momentum was not 0 on the vertical axis. Which might explain why it didn't reverse direction when your reversed the wheel. Anyways great video
It's background music automatically generated from Pinnacle studio... sorry it doesn't really "exist" beyond that snippet...
Your trim looks like the thing I clean my dishes with
But no one actually explains whats happening in the wheel
Excelent video.
Your question doesn't make any sense. Try asking it in relation to vectors instead of orientation.
@acebodine Not really sure, Acebodine... I thought Coriolis had more to do with the earth's rotation specifically...
Where do you get all these cool toys?
You're failure fighting the angar mentum was so funny (good self mockery of yours). I had hard time thinking of the reason of this failure. I can only think of friction on the wheel axe... Maybe using a wheel with less friction and/or a greater moment of inertia? Did you find the reason / try this experience again since?
@nanoload Very astute. Yes, it relies on both, but I didn't want to get into conservation of energy at this time. One lesson at a time! (Of course, if either law didn't work, the demo would fail, so I'm just explaining part of the situation, and not spreading false information. It is common in science education to build up slowly and explain only the topic at hand... ignoring friction at first, for instance...)
Stay tuned, as my next video dealing with gyroscopic procession will be filmed entirely inside of the local fair's graviton!!!!
a good example
Thanks a lot
nice kicks!
Really nice sir
Thank you sir
@ 4:13 Orbiting yourself would be a miracle! :-) Let's call it spinning.
@sciencetheater Thats fine just womdering i like blue and have blue running shoes.
Great
could you answer this question: definiti exactly about Angular Momentum
Fascinating concepts, but I stayed for the bow tie.
nice video
Just wondering, do you have an explanation of why you didn't spin the opposite direction? I have done this demo and never had what happened to you happen to me. I'm very curious.
The demo wasn't perfect and at some point I must have managed to get a bit more angular momentum in one direction (so titing it one way would spin, tilting it the other way simply canceled it out...) If it were truly balanced I should have been able to spin one way, stop when vertical, spin back the other way when flipped...
@@sciencetheater Props to you for answering these comments 10 years after uploading!
Gyroscopic procession doesn't have anything to do with a bicycle staying up. It has to do with the way the handles turn when a bicycle is falling over and the momentum of the bicycle itself.
Ok... I think I get this but how would I calculate how fast the object would spin from the angular momentum in a 2d surface and how would I calculate the angular momentum? I wanna make simulations in programming.
Your question doesn't have any context. What you just said confuses the question even more.
No, that wouldn't fit well with how I understand Gravity works.
Nice shoes.
It's 2024 now!!!
Thanks for making this video! I have to do a presentation on an interesting property of physics for school and I'm going to pick this as my topic! =)
its been ten years....how did the presentation go?
@@rmdoomi04 Hahahaha holy sh*t dude! Talk about blast from the past.
The presentation went really well! I managed to find a bicycle wheel and spinny chair and recreated the demonstration in the video. Combined with my easy to follow slides and multiple analogies / live demonstrations, I got a perfect score of 20/20 =D
In fact, the friend who lent me the bicycle wheel (and was top of the class) only got 19/20, so I remember he was a bit jealous =P
@@Nekoflame bro you still remember the scores...I didn't think you'd reply considering its been ten years...thought you'd be dead by now no offense 😂
@@rmdoomi04 I hope you are referring to my CZcams account activity 😂
But yes, when you go the extra mile and get rewarded for it, it's a very memorable experience =)
Could someone please help me with the last experiment? My understanding is that the wheel is given an initial vertical angular momentum. The man stands on the spinning table. When he turns the wheel sideways, the angular momentum becomes horizontal. However he started with no horizontal angular momentum so to ensure a net angular momentum of 0 horizontally, the table spins oppositely. But, where did the initial vertical angular momentum go? Thanks.
IamGilgamesh666 I have the same doubt .
you are genius
If in a Newton's cradle a ball of a larger mass than the others is swung then "It knocks a bunch of them out." That is not a scientifically acceptable explanation. There must be a formula which describes what happens with the larger ball.
If you consider the balls colliding as perfectly elastic, to figure out how many "bounce out" it is a matter of using two equations (conserved momentum and conserved energy) and solving for the correct mass.
@DracoMhuuh Probably because I'm mostly a one-man show. If I don't list is otherwise, I'm the only one in the room. (About half the episodes I had one cameraman helping out...)
Thank u sir now I can imagine
it's really cool
Thank you but I understand only half😊
Awesome
is this system closed???
what's the intro song name?
nice
u r genius