101027-opp - 10/27/10 Physics 121 1 10/27/10 Physics 121 2...

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Unformatted text preview: 10/27/10 Physics 121 1 10/27/10 Physics 121 2 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% e 39% 74% f 2% 10/27/10 5% Physics 121 3 x ( 1 mv 2 ) = F net 2 r = kx x If x is changing over the interval what x should we use? = kx = 10/27/10 ( 1 2 x= k kx 2 ) xi + x f 2 Physics 121 ( xf ) xi = 1 2 ( k x2 f xi2 ) 9 ( mv + kx ) = 0 2 1 2 1 2 U s = kx 1 2 10/27/10 2 2 Physics 121 10 lose KE 10/27/10 gain KE Gravity: Conservative lose KE both ways 1 Friction: Non-Conservative 1 Physics 121 12 net ( mv ) = Fall r 2 12 net net ( mv ) = Fcons r + Fnon 2 10/27/10 Physics 121 c r 12 12 net net ( mv ) = Fcons r + Fnon c r 2 12 ( mv ) = U + Fnnet c r on 2 net ( 1 mv 2 + U ) = Fnon 2 10/27/10 Physics 121 C r 13 10/27/10 Physics 121 14 Mechanical ( 1 mv 2 + mgh + 1 kx 2 ) = 0 2 2 1 2 mv i2 + mghi + 1 kx i2 = 1 mv 2 + mgh f + 1 kx 2 2 2 2 f f 10/27/10 Physics 121 15 10/27/10 Physics 121 16 10/27/10 Physics 121 17 Energy change Power = time to make the change r W net = =F = F net v (for mechanical work) t t 10/27/10 Physics 121 18 10/25/10 Physics 121 20 ...
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101027-opp - 10/27/10 Physics 121 1 10/27/10 Physics 121 2...

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