Question

(a) When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.

(b) How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

Answer 1

(a) Work is said to be done when a force is applied on an object and the object moves due to the force in the direction of the force.
The work done by a body in moving up against gravity = mgh

where m is mass, g is the acceleration due to gravity and h is the height.
(b) Given,

Force = F = 2 N

Displacement = s =10 cm = 0.1 m