Answer
a. Shown in diagram. There are two normal forces, and gravity.
b. Shown in diagram. The resultant of the two normal forces is equal and opposite to the stone’s weight, so the resultant of all three forces is zero.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 5 - Think and Explain - Page 87-89: 67
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