Conceptual Physics (12th Edition)

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

Chapter 2 - Reading Check Questions (Comprehension): 23

Answer

100 N.

Work Step by Step

Assuming that you are pushing horizontally so that the crate's weight is canceled out by the floor's upward, vertical support force, the force of friction is 100 N. The crate is in dynamic equilibrium so the net force on it is zero. Your push of 100 N (say, to the right) is canceled out by the frictional force of 100 N, directed to the left.
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