Question

Which of these statements describe the correct properties of friction?

A. Rolling friction is always greater than sliding friction.

B. Friction acts in the opposite direction of relative motion.

C. Friction causes the surfaces in contact to wear away.

D. Friction produces heat energy.

• A. , C, D
• B. A, B, C, D
• C. A, B, D
• D. B, C, D

Answer 1

The correct option is D B, C, D

Friction always opposes the relative motion between two objects.

We also know that it generates heat and wears out surfaces in contact.

And, Rolling friction < Sliding friction < Static friction

Hence Statement A is incorrect and statements B, C and D are correct.