Work (W) is said to be done, when a force (F) acts on the body and point of application of the force is displaced (*) in the direction of force.
(i) If the body is displaced in the same direction of force, work is done by a force
(ii) If the displacement is against a force, the work is done against the force.
(iii) If the displacement is perpendicular to the direction of the force, work done is zero.
Unit of work
Unit of work is joule (J).
One joule of work is said to be done when a force of 1 newton acting on a body displacing it by a distance of 1 m.
Larger units of work are
(i) kilojoule (1000 joule)
(ii) megajoule (10 lakh joule)
