Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 8 - Reading Check Questions (Comprehension): 10

Answer

As distance increases between most of the mass and the rotational axis, the rotational inertia increases. When you bend your legs, you're bringing mass closer to the axis of rotation (your hips), they have less rotational inertia, and their rotational speed can be changed more easily.

Work Step by Step

This is discussed on pages 136-138.
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