06/06/2026
Work done
Work is done by a force on a particle when the body displaces in the direction of applied force.
When the direction of the force and that of displacement are same, the work done by the force on the particle is equal to product of the force and displacement.
When the direction of displacement and that of force are different, work done by the force on the body is product of displacement and component of force in the direction of the displacement.
When work is done, energy transforms from one form to another. For example, when a particle falls due to gravity, work is done by the gravitational force on the particle. Consequently, potential energy is transformed to kinetic energy.
Question to the reader:
A watchman stands at the entrance for 8 hours. Does gravitational force do work on the man? Why the watchman gets tired?
