Question

Block A of mass 4 kg and block B of mass 6 kg are resting on a horizontal surface as shown in the figure. There is no friction between the block B and the horizontal surface. The coefficient of friction between the blocks is 0.2. If the value of $g=10\,m/{{s}^{2}},$ the maximum horizontal force F that can be applied on block B without any relative motion between A and B is

• A. 20 N
• B. 40 N
• C. 60 N
• D. 100 N

Answer 1

Answer: (A)

20 N

Answer 2

We know that $F=ma$ For combination of blocks $m=10\,\,kg$ and $a=2\,\,m/{{s}^{2}}$ $F=10\times 2$ $F=20\,\,N$