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College Physics

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

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BuyFindarrow_forward

College Physics

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

If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall.

To determine

The direction of the friction force exerted by the wall on the book.

Explanation

Friction force of two objects in contact refers to the force exerted by an object on the other during their relative lateral motion. The direction of friction force is parallel to the surfaces of the objects in contact.

Conclusion:

As the book is pressed against the wall, the weight of book pulls it downwards. Friction force opposes the force due to the weight of the book. Thus, option (b) is correct.

Friction force always opposes the relative lateral motion of the objects...

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