Question

Which quantity does not change when an ice skater pulls in her arms during a spin?1) angular momentum2) angular velocity3) moment of inertia4) mass

Answer 1

1) angular momentum

Explanation:

The moment the ice skater pulls her hands, she begins to spin slower, then turns very fast when she brings her arms out to her sides.

Here we can see applied the fundamental law of conservation of angular momentum. where rotational speed and shape are related, therefore there is no change in angular momentum.