Question

A force of 50n moves a body, i. friction force exerted on the body is less than 50n ii. friction force exerted on the body is more than 50n iii. none of these iv. both of i and ii

Answer 1

friction force exerted on the body is more than 50n

Answer 2

If a force of 50N moves a body then the frictional force exerted on the body is less than 50N.

Friction:

• Friction is the resistance encountered by a moving body by the surface it is in contact with.
• Frictional force always opposes relative motion between bodies.

Types of frictional forces:

1. Static Friction: This acts when the body is at rest.
2. Limiting Friction: This acts when the body is about to move but is still at rest. This is the maximum value of friction for two given surfaces.
3. Kinetic Friction: This acts when the body is in motion.

• In the given question, kinetic friction acts. Since the body is still moving this means that net forward force is more than the net retarding force.

• Hence, the frictional force experienced by the body must be less than 50N.