Angular Momentum - Clay Puck and Stick Collision

Physics Ninja looks at a collision problem involving conservation of angular momentum. Linear and angular momentum conservation are used to solve for the velocity of the center of mass and the angular velocity after the collision. The kinetic energy before and after the collision are compared.

[enricolucarelli]

Finally someone who dares to remove any pivot point!😁 Thank you! 👏👏👏👏
It is interesting to notice that there is a point, 5L/12 above the CG, that will start moving along a cycloid.
Thus, we can use a similar calculation to find out where to hold the handle of a hammer when hitting a nail, in order to minimize the impact on the wrist 👍

[arkajyoti]

Man i cant thank you enough for your efforts in making these detailed videos for us. Love your dedication in explaining every minor concepts while solving problems 🙏❤

[ashurbanipal]

you're very good teacher. your style to describe topics is very clear / understandable. you are helping too much. thanks you for your videos.

[InfuriatedFrog]

Found your channel and now I’m loving physics even more than I already did

[sarthakghoshrollno.]

I love physics very much, specially mechanics, and i found this video very useful. Thanls for this interactive style, that's beautiful.

[tozaisusovac]

Thanks a ton, I was a bit stuck on how to formulate the proper equation, I forgot to account for the puck´s moment of inertia :)

[fredthecoder]

Ninja, good video. But I ma not sure about the sin(90) justification. Isn't theta the angle between the linear velocity vector and the position vector from the axis of rotation to the combined system's centre of mass ? If the combined mass is rotating about the system centre of mass, won't 'd' be just zero?

[samsara]

Can you do the same exersice in 3D with two rigid bodies moving in 3D space, please?

[mikemaas]

Great explanation, thanks! I would just suggest not using capital L for both length and angular momentum in the derivation. Can be a bit confusing for students new to the topic.

[Test-ivpm]

What happens to the energy that is not conserved from Ki to Kf?

[Ninjamanguy]

Isn’t gravity and the normal force from the ground considered external forces? Why are they not considered when evaluating if linear momentum is conserved?

[pxpjuxk]

hope you put some specific variables example😊