Questions
A block of mass 'M' is pressed against a wall with a horizontal force F. Then
a) it will slide down if the wall is smooth
b) frictional force may balance the weight if the wall is rough
c) Normal reaction is equal to weight of the block
d) Normal reaction is zero if the wall is smooth
detailed solution
Correct option is A
The block has a tendency to slide down , so frictional force must oppose this tendency and so friction is verrically upward.If the wall is smooth , there will be no friction.Normal reaction of wall must be equal in magnitude but opposite to F.Talk to our academic expert!
Similar Questions
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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