Physics-
General
Easy
Question
Given 
. Between A and B 
, between B and C 
and between C and ground 
. 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 
)
- 60 N
- 90 N
- 80 N
- 50 N
The correct answer is: 50 N
Limiting friction between A & B = 60 N Limiting friction between B & C = 90 N Limiting friction between C & ground = 50 N Since limiting friction is least between C and ground, slipping will occur at first between C and ground. This will occure when F = 50 N.
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