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Question

If a book placed on a horizontal desk is pushed towards right, what will be the direction of frictional force acting on it?


A

Towards right

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B

Vertically upwards

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C

Vertically downwards

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D

Towards left

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Solution

The correct option is D

Towards left


Frictional force always opposes relative motion between two surfaces in contact. As the book is being pushed towards right, friction will act towards left to oppose this impending motion.


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