Question

A block of mass $0.5kg$ rests against a wall exerting a horizontal force of $10N$ on the wall. If the coefficient of friction between the wall and the block is $0.5$ then the frictional force acting on the block will be:

• A. $49.9N$
• B. $9.8N$
• C. $5N$
• D. $0.49N$

Answer 1

The correct option is C $5N$

Now,

Given, $N=10$ Newtons

$\mu =0.2$

Frictional force is $N\mu$

$=\left(0.5\right)\left(10\right)$

$=5$ Newtons

Now the downward force $=0.5g$

$=5$ Newtons

So this is equal to the maximum possible frictional force acting.

Hence, frictional force $=5$ Newtons