University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 10 - Dynamics of Rotational Motion - Problems - Discussion Questions - Page 328: Q10.14

Answer

The order of arrival at the bottom is: solid sphere, solid cylinder, spherical shell, and hoop.

Work Step by Step

This exact problem is covered in Example 10.5 on page 312. Objects whose mass is relatively close to the axis of rotation, and which have a low moment of inertia, will be moving faster at the bottom. This is because a smaller fraction of their kinetic energy is tied up in the form of rotational kinetic energy, and more is available in the form of translational kinetic energy. The statement is independent of mass and radius.
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