A figure skater on ice spins on one foot so there is minimal friction. She pulls in her arms and her rotational speed increases. Choose the best statement below:

1.When she pulls in her arms, her rotational kinetic energy is conserved and therefore stays the same.

2. When she pulls in her arms, the work she performs on them turns into increased rotational kinetic energy.

3. When she pulls in her arms, her angular momentum decreases so as to conserve energy.

4.When she pulls in her arms, her rotational kinetic energy must decrease because of the decrease in her moment of inertia.

5. When she pulls in her arms, her moment of inertia is conserved.

6. When she pulls in her arms, her rotational potential energy increases as her arms approach the center.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Conservation of Angular Momentum concept. You can view video lessons to learn Conservation of Angular Momentum. Or if you need more Conservation of Angular Momentum practice, you can also practice Conservation of Angular Momentum practice problems.

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Based on our data, we think this problem is relevant for Professor Florin's class at TEXAS.