Question

All the blocks shown in the figure are at rest. The pulley is smooth and the strings are light. Coefficient of friction at all the contacts is 0.2. A frictional force of 10 N acts between A and B. The blocks A is about to slide on block B. The normal reaction and frictional force exerted by the ground on the block B is:

• A. The normal reaction exerted by the ground on the block B is 110 N
• B. The normal reaction exerted by the ground on the block B is 50 N
• C. The friction force exerted by the ground on the block B is 20 N
• D. The friction force exerted by the ground on the block B is Zero

Answer 1

Answer: (A), (D)

The correct options are
A The normal reaction exerted by the ground on the block B is 110 N
D The friction force exerted by the ground on the block B is Zero