Angular Momentum of Particles Introduction

0:00 Intro
0:13 The basic concept of point particle angular momentum
1:04 Demonstrating point particle angular momentum
3:39 Demonstrating angular momentum depends on mass
4:42 Demonstrating angular momentum depends on velocity
5:52 Demonstrating angular momentum depends on “r”
6:49 Demonstrating angular momentum depends on θ
7:29 Visualizing the “r” vector
8:07 What happens when the angle is 180 degrees?
8:45 The right-hand rule for angular momentum direction

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Thank you to Jonathan Sullivan-Wood for transcribing the English subtitles of this video.

[curtbixel]

I've been teaching physics for 20 years. I'm good at it. The quality of instruction in this video is stunningly good. There is no point in me even developing a lesson or lecture on this topic, as it simply could not be done better or more clearly than this.

[lovejilly]

Mr. P, you never cease to amaze me. I started watching your videos as a sophomore when I took Honors Physics 1. Your videos helped me score a 5 on the AP Physics 1 exam. You made me love and enjoy physics so much that I decided to take the AP exam without taking the class. Next year, I will be taking AP Physics C as a senior. I cannot wait to continue my physics journey with you. ❤️

[huntingresonance]

these are just getting better and better!! thank you!

[kavitapabelkar]

Amazing video! So beautifully explained. Hats off to you, Mr P!

[alexandrudanciu]

The ball gets its angular momentum from the diagonal between the lazy Suzan and the very point where ball hits. I don't know how to explain mathematically like you but you got the point which should be correct from my point of view.
I've got this question and explanation from the other video of yours with the same ball and the same board. When you drew that line from the pivotal point to the point where ball hits I understood immediately why the ball turned back on a slightly circular path instead of a straight one. That was the reason but I just cannot explain it mathematically.

[victorschannel]

Amazing way of teaching! Even though I haven't studied this topic so far, I kind of understood it.

[krishnakapoor]

These videos deserve millions of views

[Carlosk]

this video would have helped me with the frqs from this years exam
the one about the ball sliding with friction :(

[debotrialaccount]

If we took another reference pivot point the radius will change and so the angular momentum of the particle. so considering this fact will I be wrong if I conclude the angular momentum of the particle is not instinct to the particle rather found relative to the pivot point that we can arbitrarily choose. In other words "will the point particle still have angular momentum if there was no reference point? or is it the linear momentum converted to angular momentum during the collision?". In short "Is the angular momentum of the particle ideal assumption (to ease our calculation) or actual in the physical world?"

[nasirkhalid]

Great, amusing and well demonstrated.

[andrewjustin]

Did any brilliant catch it? That L = p × R, where L and p is angular and liner momentum and R is the distance from the AOR to the CM. Also × is cross product!!

I know it's derivation! Mr. Jonathan, please allow me! I derived this on my own before this video and now it's confirmed I was correct!

L = I w
For a point mass like an electron, I = MR^2

L = w M R^2
But theta is nothing but 2 pi / T (I'm driving this for an electron in Newtonisn Mechanics)
Then
L = 2 pi R/ T times M R

But 2 pi R/ T is just tangential velocity so:
L = v M R
L = Mv R
Where Mv = p
L = pR which is L= p × R

Voila!

[patzha]

Please review more full AP Physics C tests

[geekazoid]

My school does not provide AP physics C Mechanics, but I have found a teacher that is willing to help me take it an independent study, with one stipulation. I need to find resources online that we can construct a curriculum around. I was wondering if you knew of any resources that can track homework, assessments and such

[AIIMSNagpur.]

SIR
PLS MAKE A VIDEO OF WHERE THE TORQUE IS 0 IN CASE OF CONSERVING ANGULAR MOMENTUM IN ROLLING ON ROUGH AND SMOOTH SURFACE
PLSS🙏

[debotrialaccount]

I am confused about the theta angle. I mean the theta angle is the measure of angle between the 'r' vector and the velocity 'v' vector but this angle changes when the ball keeps moving. So when is the right time to take the angle.
For example: When the ball roll down perpendicular relative to the board the angle theta gradually increases as the ball approaches the board. In fact I think it will reach ~90 degrees just before the collision. So "When is the right time to take/measure theta"?

[upkarchana]

At 7:50, you show an angle theta in the diagram. Having the ball strike the board the same way it does on the left would cause the largest angular momentum being that sin(90) = 1, but the angle shown in the diagram doesn't look like 90 degrees. Is this just to show how to measure the angle used, or do I just have a walnut-sized brain?

[iantolk]

w.r.t. the angular momentum which the board has after the collision, why can't the cause be the force of the ball hitting the board? I don't disagree that the ball has angular momentum, but I'm not sure how this example 'proves' it - since a force (with no angular momentum) applied to that spot of the board will cause the board to rotate as well. Maybe I'm missing something.?.

[irfanzamri]

thanks im looking forward to invent time