What is energy & types of energy

What is Energy?
Energy can be defined as the capacity to do work.

Types of Energy


Mechanical Energy: - By definition mechanical energy is the sum of Kinetic energy(K.E) and Potential energy(P.E).
Mechanical energy = Kinetic Energy + Potential Energy

Kinetic Energy: - Kinetic energy is the energy due to a body’s motion.
K.E = 1/2 mass × velocity2

Potential Energy: - Potential Energy is energy due to a body’s position or condition.
P.E = mass × gravity × height

Law of Conservation of mechanical energy
In a system where only forces associated with potential energy are acting (gravitational/ elastic), the sum of the Kinetic and Potential energies is constant.
K.E + P.E = Constant

These conditions exist for any object rising of falling above the earth’s surface:

  1. For a body that is rising:
Loss in K.E = Gain in P.E

     2.  For a body falling towards the earth:

Loss in P.E = Gain in K.E

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3 Response to What is energy & types of energy

July 7, 2011 at 12:33 AM

I really enjoyed reading this post, Keep up the good work & when you publish more articles or where can I read more on the subject..Thanks and keep up the good work.

July 7, 2011 at 4:35 AM

This post has brought me back to my years in Junior School when our Science teacher taught us about energy.

December 16, 2015 at 11:43 PM

nice blog about energy. very easy explanation. thanks to author.

Mechanical Energy

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