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Work and Energy


When a force is applied on an object and the initial position of the object changes then it is said that work is being done by the force. The unit of work is joule (J), 1J = 1N.

W = F.s.cosθ

Where, F is the force acting on the object, s is the displacement of the object and θ is the angle between the force and the displacement.

Work can be both positive and negative. If the component of force acting on the body and the displacement of the body are in same direction the work is said to be positive. If the displacement of the object and the force acting on the body are in opposite direction then the work done is said to be negative.


Energy can be defined as the ability to do work. Energy is a property which is transferred to an object in order to perform work. There is a strong connection between work and energy. The law of conservation of energy states that energy can neither be created nor be destroyed it can be only transferred from one form to another.

The SI unit of energy is joule (J). 1 Joule is the work done by 1 Newton moving 1 meter.

1 J = 1 N × 1 m

The Joule has the units Nm, or kgm²/s²

Different forms of energy are:

  • Kinetic Energy
  • Potential Energy


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