Question

Define potential Energy. Write expression for Potential Energy possessed by a body lifted to

certain height ‘h’. A person of 60kg climbs a stair case and reaches to a height of 4m.

Calculate the potential energy acquired by the person. (take g = 10m/s2)​

Answer 1

The energy possessed by a body due to its position or configuration is called potential energy.

Consider a body of mass ‘m’ lying on the surface of the earth. Force required to lift the body is equal to its weight

∴F=mg

Let it be lifted through a height ‘h’,

The work done on the body is W=FS

W=mgh(∵S=h)

This work done is stored in the body as its potential energy,

∴E

p

=mgh

i.e. Gravitational potential energy =mgh

Its unit is Joule.

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