Work Energy and Power – Class 11 | Chapter – 6 | Physics Short Notes Series PDF for NEET & JEE

Work Energy and Power: The relationship between work, energy, and power is given by the work-energy theorem, which states that the work done on an object is equal to its change in kinetic energy. Power is the rate at which work is done, or the rate at which energy is transferred. Understanding these concepts is important in a wide range of applications, including the design of machines and structures, the study of motion and mechanics, and the development of energy systems.

Work Energy and Power

Work energy and power are three interrelated concepts in physics that are used to describe the motion of objects and the transfer of energy between them.

  • Work: Work is defined as the product of the force applied to an object and the distance over which that force is applied. It is a scalar quantity and is measured in joules (J). When a force is applied to an object and causes it to move, work is done on the object.
  • Energy: Energy is the capacity of an object to do work. There are two types of energy: kinetic energy and potential energy. Kinetic energy is the energy of motion and is proportional to the mass of an object and the square of its velocity. Potential energy is the energy that an object possesses due to its position or configuration.
  • Power: Power is the rate at which work is done or energy is transferred. It is measured in watts (W) and is equal to the amount of work done or energy transferred divided by the time taken to do it.

Formula & Units of Work Energy and Power

Work Energy Power
Formula W = F × d P.E. = mgh P = W/t
Unit Joule (J) Joules (J) Watt (W)


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