Conceptual Physics (12th Edition)

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

Chapter 20 - Think and Explain: 71

Answer

Marchers break step when they cross a bridge so the frequency of their footsteps won't accidentally resonate with one of the bridge's natural frequencies. If resonance occurred, the amplitude of the bridge's vibrations would increase, and the forced oscillations might break the bridge apart.

Work Step by Step

This is discussed on page 383.
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