I K.E.Kinetic energyWork done by an external forcei ma dr△Wi-2=i F.dr=drdvF[? mi·dydrdtd(.)d2mC21I22mV2mV-22= △K.E. (change in K.E.)Jumpto firstpage
Jump to first page dr F Kinetic energy K.E. Work done by an external force . . (change in K.E.) 2 1 2 1 d 2 2 d( ) d d d d 2 1 2 2 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 K E m v m v v v v m m r mv v dt dv m W F r ma r = = − = = = = = − =
Power PEnergy dissipated per unit timeF.drdU=F.二二dtdtJumpto firstpage
Jump to first page Power P Energy dissipated per unit time F v t F r t U = = = d d d d