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Lecture09_Pushkar

# Lecture09_Pushkar - PHYSICS 220 Lecture 9 Work and Kinetic...

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Lecture 9 Purdue University, Physics 220 1 Lecture 9 Work and Kinetic Energy PHYSICS 220

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Lecture 9 Purdue University, Physics 220 2 Energy Energy is “conserved” 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
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 3

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Lecture 9 Purdue University, Physics 220 4 Newton’s Second Law leads to definitions of work and energy The connection between force and energy is work
Lecture 9 Purdue University, Physics 220 5 Work and Energy Work: Transfer of Energy by Force W = | F | | r | cos θ W depends on the direction of the force relative to the displacement

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Lecture 9 Purdue University, Physics 220 6 Work by Constant Force
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