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 - Multiple Choice Questions - Page 132: 15


coefficient of kinetic friction (c) is usually smaller than the coefficient of static friction.

Work Step by Step

It takes more force to get a body in motion from rest (case 1-the coefficient of static friction), than it takes to keep a moving body in continuous motion (case 2-the coefficient of kinetic friction). From kinematics, the initial speed in case 1 is zero. Enough force must be applied to counteract friction and accelerate the body to its final speed. In case 2, the initial speed and final speeds are equal. A force to only counteract friction is to be applied here.
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