Conceptual Physics (12th Edition)

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

Chapter 2 - Think and Explain: 67

Answer

The force that prevents the book from accelerating downward is the upward support (normal) force from the table that pushes on the book.

Work Step by Step

This is discussed on page 32.
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