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AP® Physics C: Mechanics

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Moderate

Net Torque, Angular Momentum and Conservation of a Yo-Yo

APPHMC-SXZK6G

Nick Borowicz. Created for Albert.io. Copyright 2016. All rights reserved.

A yo-yo unwinds as it spins downward towards the ground, as shown above.

Which of the following best describes the resulting motion?

A

The net force applied by gravity causes the linear and angular momentum of the yo-yo to increase as it descends.

B

The net force applied by tension causes the linear and angular momentum of the yo-yo to increase as it descends.

C

The force is zero, but the net torque is not. As a result, the linear momentum of the yo-yo increases but the angular momentum remains constant.

D

The net torque applied by the force of tension causes the angular momentum of the yo-yo to increase as it descends.

E

The net torque applied by the force of gravity causes the angular momentum of the yo-yo to increase as it descends.