In which direction the force of friction will act when a book kept on a desk is pushed towards the left?
[2 marks]

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Solution

Frictional force opposes relative motion between the two surfaces in contact.Thus, the direction of frictional force is opposite to the direction of relative motion. [1 mark]

When the book is pushed to the left, it tends to move to the left. Hence, the friction force exerted by the surface on the book is towards the right. [1 mark]

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