Question

A block is pushed on a rough surface with a force of $50N$. If the limiting friction for the block is $80N$, then the frictional force acting on the block is

• A. $30N$
• B. $80N$
• C. $50N$
• D. $130N$

Answer 1

The correct option is C $50N$

Limiting friction is the maximum value of static friction up to which it can resist the motion of an object. Here the value of limiting friction is $80N$, so if the applied force is less than $80N$ then the resisting friction will self adjust according to the applied force. Here the applied force is $50N$ so the static friction value will also come out to be $50N$. Hence option (3) is the correct option.


Since the applied force < Limiting friction
Object will be at rest with static friction = applied force = $50N$