# AP Physics C: Rotational Dynamics Review - 2 of 2 (Mechanics)

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Calculus based review of the cross product torque equation, how to do a unit vector cross product problem, rotational equilibrium, the rotational form of Newton’s second law, the angular momentum of a particle and of a rigid object with shape, the derivation of conservation of angular momentum, and a conservation of angular momentum example problem which reviews a lot of the pieces necessary to understand conservation of angular momentum.

For the calculus based AP Physics C mechanics exam. Want Lecture Notes?

Content Times:

0:15 The cross product torque equation

1:10 Unit vector cross product example problem

3:32 Rotational equilibrium definition

4:55 Rotational form of Newton’s second law

5:37 Angular momentum of a particle

7:08 Angular momentum of a rigid object with shape

7:49 Conservation of angular momentum derivation

8:57 Conservation of angular momentum example problem

10:57 Visualizing the problem

12:04 The conservation of angular momentum equation

12:54 Solving for the constant value of the variable y.

14:04 Substituting in known values

15:38 Does our variable answer make sense?

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