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 µ. What acceleration given to B will cause slipping to occur between A and B
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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.
$f = m_{A} \times a$
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.
i.e. for slipping, $m_{A}a = \mu m_{A}g$ 
$a = \mu g$
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