Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Discuss - Page 73: 120

Answer

4000 N.

Work Step by Step

Sliding down at constant velocity means the bear is in dynamic equilibrium, the acceleration is zero, and the net force is zero. This can only occur if upward-pointing friction forces counteract the bear’s weight, which is mg = 4000 N. Friction is equal and opposite to the bear’s weight.
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