Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Angular momentum is conserved.

Question

Quizplus · Accepted Answer

According to the law of conservation of angular momentum, the angular momentum of a system remains constant if there are no external torques acting on it. In this case, the skater is a closed system, and by pulling her arms inward, she decreases her moment of inertia, which causes an increase in her angular velocity, but the product of her moment of inertia and angular velocity (angular momentum) remains constant. Therefore, angular momentum is conserved.

Consider a Situation Where a Skater Pulls Her Arms Inward