10/25/10 1 Physics 12110/25/10 2 Physics 12110/25/10 3 Physics 121 mxFtxvxmFxtvmFtvmFanetnetnetnet==== /10/25/10 4 Physics 121 xFvvmmxFvvmxFvvvvmxFvvmxFtxvnetifnetifnetiffinetnet===+==)()()(222212221Definitions: Kinetic energy = Work done by a force F = Result 221mvxF xFmvnet= )(22110/25/10 5 Physics 121 F||FFssFsFsF ==cos Work ||10/25/10 6 Physics 121 F||FFsFsF ||sFsF = cosyyxxbababaabba+==cosIn 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 coordinate system we select.10/25/10 7 Physics 121 m a = F net12mv2()= F net r KE = W10/25/10 10 Physics 121 F r = U10/25/10 11 Physics 121 (12mv2) =Fnet r = mg r = mg h10/25/10 12 Physics 121 mghUmghmvg==+ 0)(22110/25/10 13 Physics 121 ffiimghmvmghmvmghmv+=+=+2212212210)(Mechanical10/25/10 17 Physics
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