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: 83b

Answer

52.8 Newtons

Work Step by Step

Once the crate is moving, the friction we are concerned with is kinetic friction. Once again we use the normal force of 165N but now we use fk = 0.32. Therefore, the force of kinetic friction is 165*0.32 = 52.8 N. To keep the box moving at constant speed means there is no acceleration and therefore no net force. This means the force you exert on the crate must be equal to the frictional force of 52.8N
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