Can energy be destroyed? - Yahoo! Answers

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can energy be destroyed


Conservation of energy - Wikipedia, the free encyclopedia

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** Conservation of energy **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the law of conservation of energy in physics. For
sustainable energy resources, see Energy conservation.


This article *needs additional citations for verification*. Please help
improve this article by adding citations to reliable sources. Unsourced
material may be challenged and removed. /(February 2013)/

File:Physicsworks.ogg 
Prof. Walter Lewin demonstrates the conservation of mechanical energy,
touching a wrecking ball with his jaw. (MIT Course 8.01)^[1]

In physics, the *law of conservation of energy*, imperfectly recognized in
the nineteenth century, states that the total energy of an isolated system
cannot change—it is said to be /conserved/ over time. Energy cannot be
created or destroyed, but can change form; for instance, chemical energy
can be converted to kinetic energy.

A consequence of the law of conservation of energy is that a perpetual
motion machine of the first kind cannot exist. That is to say, no system
without an external energy supply can deliver an unlimited amount of energy
to its surroundings.^[2]

In the early twentieth century, with understanding of the special theory of
relativity, it was seen that the total energy and total mass of a system
are equivalent, in a universally fixed proportion to one another. Thus in
the twentieth century it was recognized that the conservation law
statements, of total mass and of total energy, have the same underlying
physical meaning.

According to the special theory of relativity, the mass of a body or system
at rest, relative to the observer measuring it, is called its rest mass.
Its equivalent rest energy can be converted to or from other forms of
energy, such as kinetic, potential, or radiant energy. Thus, in contrast
with


Source: en.wikipedia.org/wiki/Conservation_of_energy

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