First slide

Friction on horizontal surface

Question

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

Moderate

A

a and b are correct
B

a and d are correct
C

c and d are correct
D

b and c are correct

Solution

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.

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