Question

A block A of mass 2 kg rests on another block B of mass 8 kg which rests on a horizontal floor. The coefficient of friction between A and B is 0.2 while that between B and floor is 0.5. when a horizontal force of 25 N is applied on the block B. the force of friction between A and B is
A. zero
B. 3.9 N
C. 5.0 N
D. 49 N

Answer 1

Correct Answer - A

`f_(max)` on B=80 N
`B f_(max)=80 N`
B will not slide on ground
So force =0.