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Easy
Question
Find the least horizontal force P to start motion of any part of the system of the three blocks resting upon one another. The weights of blocks are A = 300N, B= 100N and C= 200N. Between A and B the coefficient of friction is 0.3, between B and C is 0.2 and between C and the ground is 0.1
- 60 N
- 90 N
- 80 N
- 70 N
The correct answer is: 60 N
= 0.1 (300+100+200)=60N
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