Law of Conservation of Energy

Introduction to law of conservation of energy:

Law of conservation of energy is one of the greatest generalizations in physics.  According to this law “energy cannot be created or destroyed.  It can be transformed from one form into another, but the total amount of energy never changes”. When we considered any system in its entirety, whether it is a simple as a swinging pendulum or as complex as an exploding galaxy, there is only one quantity that does not change; and i.e. energy. I like to share this Definition Kinetic Energy with you all through my article.


Explanation to law of conservation of energy


Energy may change form or it may be transferred from one place to the other, but the sum total of energy stays the same.  For example:

i) The sun shines because some of its nuclear energy is transformed into radiant energy.

ii) In nuclear reactors, nuclear energy is transformed into heat and so on.

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Description to law of conservation of energy:


We are familiar with the potential energy of the body, which is due to its position or configuration.  The energy possessed by a body by virtue of its velocity is called kinetic energy of the body.  The some of kinetic energy and the potential energy is called the total mechanical energy.  In the absence of friction, (which is a non conservative force) the total mechanical energy of a system remains constant.  The necessary condition for energy conservation is that internal forces must be conservative and the external forces should do no work.  If non conservative internal forces operate within the system or external force do work on the system, mechanical energy changes.  Einstein established mass energy equivalence, (E = mc2) and the law of conservation of mass was included in the law of conservation of energy itself.  For example the mass of a bound system like a nucleolus is not exactly equal to the sum of masses of its constituents, the protons and neutrons.  It is slightly less, by an amount equal to the binding energy (B.E.) divided by the square of the speed of light.  Thus,

Mass of a bound system = some of the masses of its constituents - B.E./c^2.