Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Explain: 66

Answer

The two forces are the support force from the floor, and your weight mg. These forces are equal and opposite when you don't accelerate. If you're accelerating upward, the normal force from the floor is greater. If you're accelerating downward, the normal force from the floor is less than your weight. See page 166.
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