Lecture 9

Lecture 9 - PHYSICS 220 Lecture 9 Work and Kinetic Energy...

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PHYSICS 220 Lecture 9 Work and Kinetic Energy Lecture 9 Purdue University, Physics 220 1
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There is a fact, or if you wish, a law, governing natural phenomena that are known to date. There is no known exception to this law; it is exact, so far we know. The law is called conservation of energy; it states that there is a certain quantity, which we call energy, that does not change in manifold changes which nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity, which does not change when something happens. It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number, and when we finish watching nature go through her tricks and calculate the number again, it is the same. Richard Feynman Lecture 9 Purdue University, Physics 220 2
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Energy Energy is l conserved z meaning it can not be created nor destroyed – Can change form – Can be transferred Total Energy of an isolated system does not change with time Types – Kinetic Energy – Potential Energy – Rest Energy ( E=mc 2 ) – Thermal Energy Units: Joule (J) = N m = kg m 2 / s 2 Lecture 9 Purdue University, Physics 220 3
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This note was uploaded on 05/03/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue.

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Lecture 9 - PHYSICS 220 Lecture 9 Work and Kinetic Energy...

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