FrictionEasy

Question

A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2 while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be
        

Options

A.900 N
B.100 N
C.1100 N
D.1200 N

Solution

     
F = fAB + fBG = μABmag + μBG (mA + mB) g
= 0.2 × 100 × 10 + 0.3(300) × 10 = 200 + 900
= 1100 N.

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