Two Forms of Energy

Introduction to Energy:

Energy is a capacity to do some work. Energy can exist in various forms which are mutually convertible. Since the energy is measured in terms of work therefore its units are same as that of work.

There are mainly three types of energy:

Kinetic energy and

Potential energy


Kinetic form of energy


Kinetic energy:

The work done by a body by virtue of its motion is called its kinetic energy.

It is measures by the work it can do against an opposing force before it is brought to rest.

Kinetic energy = work done against the force

= force x displacement

=F x s

Therefore, kinetic energy= (1/2) x mass x square of the velocity

I like to share this Formula for Potential Energy with you all through my article.

Potential form of energy


Potential energy: It is the energy possessed by a body due to its position with respect to another body.

The potential energy of a body with respect to the earth is measured by amount of work in the earth is measures by amount of work in lifting it through a certain vertical height.

A body of mass m is to be raised through a height h. The force with which the body is attracted by the earth is its weight mg to lift the body an equal and opposite force has to be applied.

Potential energy  =  work done to lift the body

= force x displacement

Potential energy  =  mg h.

Principle of conservation of energy

The total amount of energy in the universe always remains a constant, that is neither any more energy can be created nor any part of the energy can be destroyed, but energy can be changed from one form into another form

Examples

When a body is projected vertically upwards its velocity goes on decreasing till the velocity is reduced to zero

When the bob of a simple pendulum is displaced from its equilibrium position and then it is release, then its initial PE changes into KE in the vertical position.