Conservation of Energy

Every conservation law says that the total amount of

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Unformatted text preview: rvation law says that the total amount of some physical quantity in every isolated system is conserved. Because of this, there is an energy associated with heat, elastic deformations, electric and magnetic fields, and according the theory of relativity, even mass itself. Newtonian mechanics has it limitations; it does not work for very fast motion, for which we have to use the theory of relativity, or for atomic or subatomic systems, for which we need quantum mechanics. However, conservation of energy holds even in these realms. It is a universal conservation principle; no exception has ever been found. 2. Theory 2.1 Kinetic Energy The kinetic energy of an object is the extra energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that velocity. In classical m...
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This document was uploaded on 03/20/2014 for the course PHYS 215 at Lafayette.

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