Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 6 - Force and Motion-II - Problems: 83a

Answer

84.2 N

Work Step by Step

The crate weighs 165N and we are told the frictional coefficients are fs = 0.510 and fk = 0.32. To find the frictional force we need to find the normal force. Since the only forces in the y direction are the normal force and the weight of the crate, we know that the normal force, N = 165N. Then to find the maximum force of static friction we take Ff,max = N*fs = 84.2 N. In order to have the crate be on the verge of sliding you need to push with a force equal to the maximum Frictional Force, Ff, max
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