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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

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a & d are correct

c & d are correct

a & b are correct

b & c are correct

answer is A.

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Detailed Solution

If there is no friction, there will be no force to oppose the weight of the body so it will slide down.

frictional force may balance the weight of the body depending on the force applied on the block normal to the surface.

Normal reaction will be equal to the force applied, independent if the wall is smooth or rough.

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