Conceptual Physics (12th Edition)

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

Chapter 8 - Think and Explain - Page 156-158: 76

Answer

Please see the diagram. The CG of the ball is not directly above the point (marked with an "X") where the ball is supported by the incline. The weight of the ball has a lever arm with respect to this point of support, which results in a nonzero torque. A net torque is exerted on the ball, and it rotates.
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