Conservation of angular momentum | AP Physics | Khan Academy

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Angular momentum is conserved in all interactions. The angular impulse exerted by one rigid system on a second is equal and opposite to the angular impulse exerted by the second rigid system on the first. If the net external torque exerted on a selected system is nonzero, angular momentum is transferred between the system and the environment. The angular speed of a nonrigid system may change without the angular momentum of the system changing if the system changes shape by moving mass closer to or farther from the rotational axis.

Sections:
00:00 - Intro
00:21 - Conservation of linear momentum
02:30 - Conservation of angular momentum
03:12 - Example 1
05:30 - Example 2
07:23 - Reaction wheels
09:49 - Ice skater
11:40 - Rotating stars

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