Given m A = 20 kg., m B = 10 kg, m C = 20 kg, between B and C µ 2 = 0.3 and between C and ground µ 3 = 0.1. The least horizontal force F to start the motion of any part of the system of three blocks resting upon one another as shown in figure is (g = 10 m/s 2 ) –
Text Solution
Verified by ExpertsThe correct answer is:
D
Limiting friction between A and B = 60 N
Limiting friction between B and C = 90 N
Limiting friction between C and ground = 50 N
Since limiting friction is least between C and ground, slipping will occur at first between C and ground. This will occur when F = 50 N
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