Free AP Physics C lesson

Angular Momentum

This AP Physics C: Mechanics lesson is designed for AP Physics C self-study. It includes 2 video lessons, 4 practice questions, and an estimated completion time of 16 minutes.

Video lessons

  1. Angular Momentum

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  2. Angular Momentum (part 2)

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Practice covered

  1. A figure skater spins with arms extended. When the skater pulls their arms inward, which of the following correctly describes the changes in angular momentum and rotational kinetic energy?
  2. A disk rotates with constant angular acceleration about a fixed axis. The disk's moment of inertia is 6 kgcdotm^2. At time t = 0 the disk is at rest. At time t = 3 seconds its angular velocity is 2 radians per second. What is the angular momentum of the disk (in kgcdotm^2/s) at t = 3 seconds?
  3. A particle of mass m moves with constant speed v along a straight line at a perpendicular distance r from a fixed point O. What is the magnitude of the angular momentum of the particle with respect to point O?
  4. A disk slides on a frictionless horizontal surface and collides with a rod that is free to move and rotate on the surface. Which of the following quantities must be the same for the disk-rod system before and after the collision?
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