Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 6 - Applications of Newton's Laws - Problems and Conceptual Exercises - Page 177: 1

Answer

(a) equal to (b) II

Work Step by Step

(a) We know that the force of kinetic friction depends on the normal force and as the normal force acting on the bricks is the same in both cases, the force of the kinetic friction in case 1 is equal to that of case 2. (b) We know that the best explanation is option (II) -- that is, the normal force is the same in the two cases and the friction is independent of surface area.
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