Question

A block of mass 5kg is at rest on a rough inclined surface. If angle of inclination of plane is 60 then force applied by it on block is

Answer 1

Answer:

50N

Explanation:

force applied by block to surface is equals to the force by surface to the block.(Newton's third law).

Force applied by block=mg=5x10=50N

therefore force applied by surface to the block=50N.

Answer 2

Answer:

The force on the block with inclination angle 60 is given by mg.

Explanation:

Given: Mass of the block m= 5kg

The “angle of inclination” of the plane= 60˚

The force can be given by the formula:

F= mg

Where m is the mass of the body and g is the gravitational force with a value $=10 m / s^{2}$

F=5×10=50 N  

Because the only force acting on the body is the weight of the body since it is at rest. Also according to ""Newton’s Third Law of Motion”, “every action has an opposite and equal reaction”. Since the “force” on the block is its weight which is given by mg, so the “force” on the block with an inclination angle 60 would also be the same as mg.