Question

A body rests on a rough inclined plane. As the angle it makes with horizontal increases then the contact force between body and
inclined plane
(A) remains constant
it remains constant initially and then decreases
(a) it remains
constant initially and then increases
(D) t increases continuously​

Answer 1

Answer:

The answer is a option C

Answer 2

$contact \: force = f = \mu \: n = \mu \: mg \: \cos( \theta) \\ \\ when \: \theta = 0 \: \\ f = \mu \: mg \\ if \: \theta \uparrow \: \cos( \theta) \downarrow \\ so \: f \: will \: decrease \: with \: increasing \: \theta$

hence,option b) it remains constant initially and then decreases is the correct option