Question

A body of mass 2 kg is lying on a rough inclined plane of inclination 30°. Find the magnitude of the force parallel to the incline needed to make the block move (a) up the incline (b) down the incline. Coefficient of static friction=0.2.Concept of Physics - 1 , HC VERMA , Chapter 6:Friction "

Answer 1

Solution :
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a) To make the block up the incline plane , force should be equal and opposite to the net force acting down the Incline plane.
=μR+2g Sin30 °
=0.2 x (9.8) √3+2x9.8 x 1/2
=3.39 +9.8
=13N
with this minimum force the body move up the incline with a constant velocity as net force acting on it is zero.


b)Net force acting down the incline plane is given by :
F=2gsin30°- μR
=2x9.8 x 1/2 -3.39
=6.41 N
Due to F=6.41 N the body will move down the incline plane with acceleration . Hence the force required is zero.

Answer 2

Answer:

Explanation:

A. 13(N) B. 0(N)