Engineering Basic Mechanics Ⅱ Dynamics 工程基础力学 Ⅱ 动力学 课件 Chapter 8 Theorem of Kinetic Energy.pptx
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Chapter8TheoremofKineticEnergy
MainContents§8.1Workdonebyforces§8.2Kineticenergyofaparticleandasystemofparticles§8.3Principleofworkandkineticenergy§8.4Power·powerequation·efficiencyofamachine§8.5Conservativeforcesfield·potentialenergy·thelawofconservationofmechanicalenergy§8.6Integratedapplicationexamplesofgeneraltheorem
Therearemanyformsofmotioninnature,theseformsofmotionareessentiallydifferentfromeachother,butinterdependentandinterrelated,andundercertainconditions,betransformedintoeachother.Forexample:mechanicalmotioncanbetransformedintoelectricity,heat,sound,light,magnetism,etc,conversely,electricity,heat,sound,light,magnetismcanbetransformedintomechanicalmotion.Mechanicalenergy:Theenergyofmechanicalmotionofbodyiscalledmechanicalenergy,itincludeskineticenergy,potentialenergy.Varioustransformationofformsofmotioncontacteachotherbytheenergy.Energyisameasurementofvariousformsofmotion.Inthischapterwestudythecontactsofkineticenergy,potentialenergyandworkdonebyforcesandpower,powerequationetc.Principleofworkandkineticenergy
Principleofworkandkineticenergy6.TheconditionsoftheconservationofmechanicalenergyKeypointsinthischapter:2.Thelawoftheconservationofmechanicalenergy1.Principleofworkandkineticenergy3.Calculationofworkdonebyforces4.Calculationofkineticenergyofasystemofparticles5.Calculationofpotentialenergyofaparticleandasystemofparticles
Theforceactingonanobjectcanchangethestateofmotionoftheobject,andthisstatechangeisnotonlyrelatedtothemagnitudeanddirectionoftheforce,butalsorelatedtotheprocessofforceaction:※Thisprocesscanbemeasuredintermsoftime,forexample,theimpulseofaforcedescribesthecumulativeeffectofaforceontime.※Theworkofaf
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