Question

A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction 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. 10 N

Answer 1

Answer: (B)

0.98 N

The maximum frictional force can be 5\times $0.5=2.5N$
But the frictional force is only balancing the weight of the object, so it's value will be 0.98 N.