Question

A block of mass 0.1 kg is held against a wall applying a horizontal force of 5 N of 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 N
• B. 0.98 N
• C. 4.9 N
• D. 0.49 N

Answer 1

The correct option is B

0.98 N

Since the block is stationary, friction balances the weight of the block.
Hence, f = mg = 0.1 $\times$ 9.8 = 0.98 N