College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 2 - Conceptual Questions - Page 61: 6

Answer

The friction force from the interaction between the tries and the road surface is the external force that pushes the tires forward which in turn propels the car forward. The engine makes the tires push backwards against the road surface.

Work Step by Step

The friction force from the interaction between the tries and the road surface is the external force that pushes the tires forward which in turn propels the car forward. The engine makes the tires push backwards against the road surface, and the friction force from this interaction is an external force that pushes forward on the tires.
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