101025-opp - 10/25/10 Physics 121 1 10/25/10 Physics 121 2...

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Unformatted text preview: 10/25/10 Physics 121 1 10/25/10 Physics 121 2 a=F net /m net vF = m t v F net x= x t m net xF x v = t m 10/25/10 Physics 121 3 x F net x v = t m net F x v v= m net vi + v f F x (v f vi ) = 2 m net F x 2 2 1 vi ) = 2 (v f m 2 2 net 1 vi ) = F x 2 m(v f 10/25/10 Physics 121 Definitions: Kinetic energy = 1 2 mv Work done by a force F = 2 Fx Result ( 1 mv 2 ) = F net x 2 4 F F Work = F|| s = F cos s 10/25/10 s F s F|| Physics 121 5 F|| s F s F In general, for any two vectors that have an angle between them, the dot product is defined to be F F F|| 10/25/10 s = F cos s a b = ab cos a b = a x bx + a y by The dot product is a scalar. Its value does not depend on the coordinate system we select. Physics 121 6 ma = F net ( 1 2 mv 2 ) = F net r KE = W 10/25/10 Physics 121 7 F 10/25/10 r= Physics 121 U 10 ( mv ) = F 1 2 2 net r = mg r = mg h 10/25/10 Physics 121 11 ( mv + mgh) = 0 1 2 2 U g = mgh 10/25/10 Physics 121 12 Mechanical ( mv + mgh) = 0 2 1 2 1 2 10/25/10 mv + mghi = mv + mgh f 2 i 1 2 Physics 121 2 f 13 10/25/10 Physics 121 17 ...
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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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