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0 votes
2.4k views
in Physics by (74.3k points)

A rough vertical board has an acceleration a along the horizontal so that a block of mass M pressing against it does not fall. The coefficient of friction between block and the board is

(a) > a / g 

(b) < g / a 

(c) = a / g 

(d) > g / a 

1 Answer

+1 vote
by (70.0k points)
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Best answer

Correct option: (d) >g / a

Explanation:

Force on M = Mg 

Reaction force = Ma 

force of friction = μR = μMa

Force of friction will balance the weight. So

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