College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 4 - Force and Motion - Learning Path Questions and Exercises - Exercises - Page 138: 65


270 N

Work Step by Step

Crate starts to move after the horizontal force exerted becomes equal to the maximum kinetic friction. $f_{{s}_{max}}= \mu_{s}N$$=\mu_{s}mg= 0.69\times40\,kg\times9.8\,m/s^{2}$$=270\,N$
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