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.
• B. It will act vertically upwards.
• C. It will act vertically downwards.
• D. It will act towards left.

Answer 1

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.