Conceptual Physics (12th Edition)

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

Chapter 8 - Think and Discuss: 109

Answer

Lightweight, solid tires will beat heavy, hoop-like tires in the soapbox derby.

Work Step by Step

The youngster should use wheels with the smallest possible rotational inertia. The body of the car doesn't rotate, so it does not contribute to the rotational inertia. Remember, we want the smallest possible rotational inertia relative to the mass (page 138).
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