“Work, energy, and power are fundamental concepts that describe how forces interact with objects and how energy is transferred or transformed.”
Work is said to be done when a force is applied on an object and the object is displaced in the direction of force. Mathematically,
Where θ is the angle between force and displacement. Work is a scalar quantity and its SI unit is Joule (J).
Energy is the capacity to do work. It exists in different forms such as kinetic energy, potential energy, thermal energy, etc.
Energy is also a scalar quantity. Its SI unit is Joule (J).
Power is the rate of doing work or the rate of transfer of energy. It tells how fast work is done.
The SI unit of power is Watt (W). 1 kilowatt (kW) = 1000 watts. The commercial unit of energy is kilowatt-hour (kWh).
Energy can neither be created nor destroyed; it can only be transformed from one form to another. The total energy of an isolated system remains constant.
Work, energy, and power are interrelated and essential to understanding motion and machines. These concepts help in analyzing mechanical systems and everyday phenomena.