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Question

# When a book placed on a horizontal desk is pushed towards right, in which direction does the force of friction act on the book?

A

It will act towards right.

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B

It will act vertically upwards.

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C

It will act vertically downwards.

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D

It will act towards left.

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Solution

## The correct option is D It will act towards left. The force of friction always opposes relative motion between two surfaces in contact. If we apply a force towards left, friction acts towards right on the book. If we apply a force towards right, friction acts towards left on the book.

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