Work and Energy

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Work and energy are related with force, because an applied force can do work on an object and cause change in energy.


Work is said to be done if a force is applied on an object and moves it through the distance in the direction of force. It is the product of force and the displacement in the direction of force.
Work is a scalar quantity. In mathematical term we can say that work is the scalar or dot product of force and displacement. In SI system, unit of work is Joule (J).
Work = F.d
W = F d cosθ
Where, W = work done, F = force, d = distance and θ = angle between F and d.


Energy is the ability of the body to perform work. Unit of energy is calorie.

There are various types of energy such as

Potential Energy Kinetic energy Heat energy
Light energy Sound energy Chemical energy
Nuclear energy Electrical energy Solar energy

Wind energy

Wind energy is defined as conversion of wind energy into a useful form of energy, such as wind turbines to make electricity, windmills for mechanical power, wind pumps for water pumping or drainage, or sails to propel ships.

Potential energy

It is also called stored energy; we can say energy stored by a body due to its position is called potential energy.
Potential energy = mgh
Where, m = mass of object, g = acceleration due to gravity, h = height of the object from the reference level or ground level.

Kinetic energy

Energy of an object because of its motion is called kinetic energy.
Where, m = mass of object, v = velocity of object


The rate of doing any work with time is called power. The unit of the power is watt.
Power =

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