Conceptual Physics (12th Edition)

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

Chapter 8 - Think and Explain: 68

Answer

The frictional force exerted on the ball's surface by the lane, with the lever arm being the ball's radius, provides a torque. This spins the ball. If the lane were perfectly frictionless, a non-spinning ball would simply slide down the alley.
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