# 101025 - Physics 121 10/25/010 10/25/10 Physics 121 1...

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Physics 121 10/25/010 Prof. E. F. Redish 1 10/25/10 1 Physics 121 10/25/10 2 Physics 121 10/25/10 3 Physics 121 m x F t x v x m F x t v m F t v m F a net net net net ± = ± ± ± ± = ± ± ± = ± ± = /

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Physics 121 10/25/010 Prof. E. F. Redish 2 10/25/10 4 Physics 121 x F v v m m x F v v m x F v v v v m x F v v m x F t x v net i f net i f net i f f i net net ± = ² ± = ² ± = ² + ± = ± ± = ± ± ± ) ( ) ( ) ( 2 2 2 2 1 2 2 2 1 Definitions: Kinetic energy = Work done by a force F = Result 2 2 1 mv x F ± x F mv net ± = ± ) ( 2 2 1 10/25/10 5 Physics 121 F ± || F ± F s ± ± s F s F s F ± ± ± ² ³ ± = ± = ´ cos Work || 10/25/10 6 Physics 121 F ± || F ± F ± s F s F ± ± ± ² ³ ± || s F s F ± = ± ² ³ cos ± ± y y x x b a b a b a ab b a + = ± = ± ± ± ± ± ² cos In general, for any two vectors that have an angle ± between them, the dot product is defined to be The dot product is a scalar. Its value does not depend on the

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## This note was uploaded on 12/28/2011 for the course PHYSICS 121 taught by Professor Shawhan during the Spring '10 term at Maryland.

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101025 - Physics 121 10/25/010 10/25/10 Physics 121 1...

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