Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 6 - Think and Discuss: 89

Answer

The internal force of the brakes stops the wheel from spinning, freezing it relative to the car. The stopped wheel contacts the road, and it is the external backward frictional force exerted by the road on the tires that stops the car. If a car were sailing through deep space, applying the brakes would have no effect whatsoever.
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