Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 5 - Section 5.4 - Friction - Got It? - Page 87: 5.4



Work Step by Step

It is important to note that friction is not equal to the weight times the coefficient of friction but rather the normal force times the coefficient of friction. While the normal force often equals the weight, it does not in this case, for the chain is pushing downward, causing the normal force to increase and thus causing friction to be greater than the weight times the coefficient of friction.
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