Question

A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is $\mu$ . What acceleration given to B will cause slipping to occur between A and B

• A. $\mu g$
• B. $g / \mu$
• C. $\mu / g$
• D. $\sqrt { \mu g }$

Answer 1

Answer: (A)

$\mu g$

Answer 2

There is no friction between the body B and surface of the table. If the body B is pulled with force F then

$F = \left( m _ { A } + m _ { B } \right) a$

Due to this force upper body A will feel the pseudo force in a backward direction.

But due to friction between A and B, body will not move. The body A will start moving when pseudo force is more than friction force.