When an object is effectively isolated from external torques, such as an ice skater twirling on the tip of one skate, the angular momentum of the object:
A)can be increased by shifting mass out away from the axis of rotation.
B)can be decreased by shifting mass out away from the axis of rotation.
C)can be increased by shifting mass in toward the axis of rotation.
D)can be decreased by shifting mass in toward the axis of rotation.
E)cannot be changed except by friction at the point of contact.

Question

Quizplus · Accepted Answer

The angular momentum of an isolated system remains constant unless acted upon by an external torque. Shifting mass changes the moment of inertia and angular velocity, but not the total angular momentum.

When an Object Is Effectively Isolated from External Torques, Such