Answer
Up the wall.
Work Step by Step
Since the book is not moving, net forces on it should be zero.
Since gravitational force is acting in the downward direction, to cancel this
force, friction will act in an upward direction.
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0321740904
ISBN 13:
978-0-32174-090-8
Chapter 5 - Force and Motion - Conceptual Questions - Page 134: 14
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