Questions
The system is pushed by a force F as shown in figure. All surfaces are smooth except between B and C. Friction coefficient between B and C is . Minimum value of F to prevent block B from downward slipping is:
detailed solution
Correct option is B
Horizontal acceleration of the system isa = F2m+m+2m = F5mLet N be the normal reaction between B and C. Free body diagram of C givesN = 2ma = 25FNow, B will not slide downward if 1μN ≥mBgor μ(25F) ≥ mg or F ≥ 52μmgor Fmin = 52μmgTalk to our academic expert!
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A person just holds a block weighing 2kg between his hands & just keeps it from falling down by pressing it with his hands. If the force exerted by each hand horizontally is 50N, the coefficient of friction between the hand & the block is
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