Question

Limiting friction is also called as .......................
A) Maximum value of friction
B) Least value of friction
C) None
D) both

Answer 1

Hint : The limiting friction is the amount of frictional force beyond which an external force can overcome the friction and accelerate an object. The limiting friction corresponds to the maximum frictional force that can act on a body.

Complete step by step answer
Friction is the resistance to motion of one object moving relative to another. It can act between two solid surfaces which is called solid friction or between two layers of liquids which is known as the viscosity of the fluid.
When two bodies are in contact with each other and any one body wants to move, they exert friction on each other. For any object to move, it must overcome the limiting friction between the two surfaces.
Limiting friction corresponds to the maximum amount of frictional force that can act between two surfaces of objects. To start moving, the external force that we apply on any of the two bodies must be greater than the limiting frictional force or the limiting friction.
Hence the limiting friction is also called the maximum value of friction which corresponds to option (A).

Note
Limiting friction is often used synonymously with the limiting frictional force or with the maximum amount of frictional force so we should not get confused by that. For any of two objects in contact to move, the applied external force must be necessarily greater than the limiting value of frictional force. It cannot be equal to the limiting friction force either as in that case, the two forces will cancel each other out and there will be no movement.