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Grade 12Mechanics

In the diagram block A & B are of same mass M & the mass of the block C is M1. frction is present only under the block A.the whole system is suddenly release from rest.the minimum coefficient of friction to keep to mkeep the block A at the state of rest.

a) M1/M

b) 2M1/M

c) M1/2M

d) none of these

ans (b)

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Profile image of neeraj pawar
16 Years agoGrade 12
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1 Answer

Profile image of anandpal shekhawat
16 Years ago
hi, let block C travelled a distance x downwards and so block B trvelled the same distance horizontally work done by gravity= -M1gx P.E of spring= 1/2Kx^2 before the block A starts sliding Kx= #Mg (# is coeff. of friction) work done by gravity= P.E of spring solving both eqns. #= 2M1/M

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