Question

A block of mass $2kg$ is placed on the floor $(\mu =0.4)$. A horizontal force of $7N$ is applied on the block. The force of friction between the block and floor is:

• A. $8N$
• B. $7N$
• C. $5N$
• D. $6N$

Answer 1

The correct option is B $7N$

Limitng friction =$\mu N=0.4\times 2\times 10=8N$

As applied force is less than limiting friction so

Force of friction on block=Applied external force=$7N$