# 101027 - Physics 121 10/27/10 10/27/10 Physics 121 1...

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Physics 121 10/27/10 Prof. E. F. Redish 1 10/27/10 1 Physics 121 10/27/10 2 Physics 121 6.1 6.2 6.3 6.4 a 23% 1% 82% 46% b 4% 5% 18% 13% c 41% 9% 0% 36% d 64% 11% 5% e 39% 74% f 2% 10/27/10 3 Physics 121

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Physics 121 10/27/10 Prof. E. F. Redish 2 10/27/10 9 Physics 121 ± ( 1 2 mv 2 ) = ± F net ²± ± r = ³ kx ± x If x is changing over the interval what x should we use? = ³ kx ± x = ³ k x i + x f 2 ´ µ · ¸ ¹ x f ³ x i (29 = ³ 1 2 f 2 ³ x i 2 = ³± 1 2 kx 2 x 10/27/10 10 Physics 121 ± ( 1 2 mv 2 + 1 2 kx 2 ) = 0 U s = 1 2 kx 2 10/27/10 11 lose KE gain KE lose KE both ways Gravity: Conservative Friction: Non-Conservative
Physics 121 10/27/10 Prof. E. F. Redish 3 10/27/10 12 Physics 121 r F mv net all ± ± ± ² = ± ) 2 1 ( 2 r F r F mv net c non net cons ± ± ± ± ± ² + ± ² = ± ³ ) 2 1 ( 2 10/27/10 13 Physics 121 2 1 2 () net non C mv U F r ±

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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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101027 - Physics 121 10/27/10 10/27/10 Physics 121 1...

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