Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 4 - Dynamics: Newton's Laws of Motion - Misconceptual Questions: 2

Answer

Choices A, B, and D.

Work Step by Step

Choice A. True by Newton’s third law. Choice B. Since the car doesn’t move, the net force is zero. The only horizontal forces on it are your 400-N pushing force, and the force of friction from the road. They cancel, so they have equal magnitudes (400 N) and are oppositely directed. Choice C. The normal force exerted by the road on you will cancel your weight (assuming you have no vertical acceleration). This force is not necessarily 400 N. Choice D. Since you don’t move, the net force on you is zero. The only horizontal forces on you are the 400-N force from the car, and the force of friction from the road. They cancel, so they have equal magnitudes (400 N) and are oppositely directed.
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