Conceptual Physics (12th Edition)

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

Chapter 2 - Think and Explain: 71

Answer

The upward support force varies, as shown by the changing readings on the scale. Only when you are in equilibrium, and the net force on you is zero, does the support force on you match your weight. That is why standing at rest will produce the most accurate reading.

Work Step by Step

This is discussed on page 32.
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