Answer
The friction force between the crate and the truck accelerates the crate forward, keeping it in step with the truck.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 4 - Think and Discuss - Page 73: 106
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