Physical model

Buildingaphysicalmodel

Physicsisadisciplinethatstudiesthelawsofmattermovement,andtheactualphysicalphenomenaandlawsaregenerallyverycomplicatedandinvolvemanyfactors.Abandonthesecondaryfactors,graspthemainfactors,soastohighlighttheessentialcharacteristicsofobjectivethings,thisiscalledbuildingaphysicalmodel.

Buildingaphysicalmodelisascientificthinkingmethodforstudyingphysicalproblems.

Middleschoolphysicsmodel

Physicsmodelsatthemiddleschoolstagecangenerallybedividedintothreecategories:materialmodels,statemodels,andprocessmodels.

Mattermodel

Materialscanbedividedintophysicalmatterandfieldmatter.(Ofcourse,inmodernphysics,thereareotherformsofmattersuchasdarkmatteranddarkenergy).

Physicalmaterialmodels,suchas:masspointsinmechanics,lightsprings,elasticballs,etc.,pointchargesinelectromagnetics,parallelplatecapacitors,close-woundsolenoids,etc.,idealsingaspropertiesGas,thinlensinoptics,homogeneousmedium,etc.

Fieldmattermodels,suchasuniformelectricfield,uniformmagneticfield,gravitationalfield,etc.areallmodelsofspacefieldmatter.

Statemodel

Inthestudyoffluidmechanics,thesteadyflow(state)ofthefluid;inthestudyofidealgas,theequilibriumstateofthegas;inthestudyofatomicphysics,thegroundstateoftheatomAndexcitedstates,etc.,belongtothestatemodel.

Processmodel

Inthestudyofparticlemotion,suchasuniformlinearmotion,uniformlyvariablelinearmotion,uniformcircularmotion,horizontalthrowingmotion,simpleharmonicmotion,etc.;inthestudyofidealgasstateWhenchanging,suchasisothermalchange,equalpressurechange,isovolumechange,adiabaticchange,etc.;therearealsosomeuniformchangesofphysicalquantities,suchastheuniformdecreaseanduniformincreaseofthemagneticinductionintensityofauniformmagneticfield;theprocessofnon-uniformchange,Suchasasuddenstopofacarisanidealprocessmodel.

Usingphysicalmodels

Modelsareanabstractionofpracticalproblems.Theestablishmentofeachmodelhascertainconditionsandscopeofapplication.Whenstudentslearnandapplythemodeltosolveproblems,theymustunderstandtheconditionsofuseofthemodelanduseitaccordingtotheactualsituation.Forexample,whethertheoperationofatraincanberegardedasamasspointdependsontheconceptofmasspointandthemovementofthetraintobestudied.Whenstudyingthetimerequiredforatraintocrossthebridge,thelengthofthetrainisgenerallynotnegligiblerelativetothelengthofthebridge,soitcannotberegardedasamasspoint;whenstudyingthetimerequiredforthetraintotravelfromBeijingtoShanghai,thelengthofthetrainismuchshorterthanthatofBeijingThedistancetoShanghaiisnegligible,atthistimethetraincanberegardedasamasspoint.

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