SUMMARYThe goal of Chapter 11 has been to develop a more complete understanding of energy and its conservation.General PrinciplesBasic Energy Model•Energy is transferredto or from the system by work.•Energy is transformedwithin the system.Two versions of the energy equation areKf1Uf1DEth5Ki1Ui1WextDEsys5DKUEth5WextSolving Energy ProblemsMODELIdentify objects in the system.VISUALIZEDraw a before-and-after pictorialrepresentation and an energy bar chart.SOLVEUse the energy equationASSESSIs the result reasonable?Kf1UfEth5Ki1Ui1WextLaw of Conservation of Energy•Isolated system:The total energy is conserved. •Isolated, nondissipative system:and The mechanical energy is conserved.or Kf1Uf5Ki1UiDEmech50EmechWdiss50.Wext50DEsys50.Esys5Emech1EthWext50.Important ConceptsThework-kinetic energy theorem isWith for conservative forces and fordissipative forces, this becomes the energy equation.
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