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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A crate is sitting in the center of a flatbed truck. As the truck accelerates to the east, the crate moves with it, and doesn’t slide on the bed of the truck. In what direction is the friction force exerted by the bed of the truck on the crate? (a) To the west, (b) To the east, (c) There is no friction force because the crate isn’t sliding.

To determine
The direction of the friction force exerted by the bed of the truck on the crate.

Explanation

Static friction force acts between the surfaces of the truck bed and the bottom surface of the crate. It is the force that causes the acceleration of the crate.

Conclusion:

Static friction force is in the horizontal direction which causes the crate to move towards the east. Moreover, the direction of static friction force is in the direction of acceleration of the crate...

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