Question

Which of the following statements is NOT true?
A) Friction makes a moving object slow down and stop. B) Friction between two surfaces will produce heat. C) Friction enables an object to stay in a stationary position. D) Friction decreases if roughness of an object increases.

Answer 1

D) is not true statement

Answer 2

Friction

D) Friction decreases if roughness of an object increases.

This option is wrong because friction increases when roughness of the surface increases.

• Friction is the resistance to motion of one object moving relative to another.
• Friction is caused due to the irregularities on the two surfaces in contact.
• It depends on the nature of the two surfaces that are  in contact and also on the force acting on these surfaces.
• It is mainly of four types, namely, static friction, sliding friction, rolling friction, fluid friction.