Kinetic Energy
Objects in motion have their own energy and are able to do work. This energy is called Kinetic Energy. The Kinetic Energy (K.E.) of an object increases with the increase in the speed of the object. The kinetic energy of an object is the half of the product of the mass of the object with the square of its velocity. So in order to increase the KE of the object we have to increase the mass of the object or increase its velocity.
Kinetic Energy Formula
Suppose an object of mass ‘m’ moves with a velocity of ‘v’ then the formula use to calculate the kinetic energy of the object is,
KE = 1/2mv2
Units of Kinetic Energy
- SI unit of K.E. is Joule which is equal to 1 kg.m2.s-2.
- CGS unit of K.E. is erg.
Derivation of Kinetic Energy Formula
Work done, W = F × s …(i)
Due to force, the velocity changes to v, and the acceleration produced is a relation between v, u, a, and s = v2−u2 = 2as
s = (v2 – u2)/2a…(ii)
F = ma …(iii)
Substitute (ii) and (iii) in (i) we get
W = F × s
W = ma × (v2 – u2)/2a
W = 1/2m(v2 – u2)
If u = 0 (object starts at rest)
W = 1/2 mv2
Work done = Change in kinetic energy
Ek = 1/2mv2
This is the formula for the kinetic energy of an objrct.
Different Types of Kinetic Energy
- Radiant Energy
- Thermal Energy
- Sound Energy
- Electrical Energy
Radiant Energy
The energy of wave and particles is called the radiant energy. This type of energy does not require any medium to propagate. The energy of Sun that reaches to us is an example of Radiant Energy.
Sound Energy
The energy of sound wave is called the sound energy. This is the energy of the sound and the vibrtration in the surrounding matter. This form of energy helps human to hear.
Electrical Energy
The energy of flowing elctrons are called the electrical energy. This energy is used to power all the electric appliance in our house.
Thermal Energy
Thermal energy is form of energy that is related to heat or warmth. Thermal energy works on molecular level. Geothermal energy is the form of the thermal energy, etc.
Energy
Energy in Physics is defined as the capacity of a body to do work. It is the capacity to complete a work. Energy can be broadly categorized into two categories, Kinetic Energy and Potential Energy. The capacity of an object to do the work is called the Energy. In this article, we will learn about, Energy, Types, of Energy, the Law of conservation of Energy, and others in detail.
Before learning about energy, we must first learn about, Work Done, so let’s start with the same.
Table of Content
- What Is Energy?
- Units of Energy
- Energy Conversion: Transfer and Transform
- Law of Conservation of Energy
- Different Types of Energy
- Work-Energy Theorem
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