Law of conservation of energy pdf

Conservation of energy

If a system of objects is isolated from its environment and does not interact with its environment at all, then certain physical quantities of the system cannot change.  They are constant or conserved.  Conservation laws are considered to be the most fundamental principles of physics.

Energy is conserved for an isolated system.  There are, however, no truly isolated systems.  Interactions with the environment can be only approximately excluded.  So while conservation laws are very useful in analyzing many everyday situations, they strictly hold only for the universe as a whole.

Energy conservation for an isolated system is a fundamental principle of physics.  Energy for an isolated system is always conserved.  It may change forms, but the total amount of energy in an isolated system is constant.  Energy can, however, be converted from one form to another form.  Work is the conversion of one form of energy into another.  Energy comes in different forms, kinetic energy, potential energy, chemical energy, t

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