A body of mass m is moved from ground to a height h. If force of gravi

1.	A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find : (a) the force needed to lift the body, (b) the work done in lifting the body and (c) the potential energy stored in the body.
Answer» (a) When a body of mass m at A on ground is raised above ground through height h at B force is applied. This force applied = weight of body Force on mass m = F = mg Where ‘g’ is the force of gravity on a mass of 1 kg. (b) Work done in lifting the body = Force × displacement h W = mg × h (c) This work done W is stored in body in the form of Potential energy P.E. mgh

A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find : (a) the force needed to lift the body, (b) the work done in lifting the body and (c) the potential energy stored in the body.

Answer»

(a) When a body of mass m at A on ground is raised above ground through height h at B force is applied. This force applied = weight of body

Force on mass m = F = mg

Where ‘g’ is the force of gravity on a mass of 1 kg.

(b) Work done in lifting the body = Force × displacement h W = mg × h