Question

A block of mass $0.1\text{kg}$ is held at rest against a wall applying a horizontal force of $5\text{N}$ on the block. If the coefficient of friction between the block and the wall is $0.5$, the magnitude of the frictional force acting on the block is

• A. $2.5\text{N}$
• B. $0.98\text{N}$
• C. $4.9\text{N}$
• D. $0.49\text{N}$

Answer 1

The correct option is B $0.98\text{N}$

$\because$ Block is stationary, friction should be balanced by weight
$f=0.98\text{N}$