Buildingaphysicalmodel
Physicsisadisciplinethatstudiesthelawsofmattermovement,andtheactualphysicalphenomenaandlawsaregenerallyverycomplicatedandinvolvemanyfactors.Abandonthesecondaryfactors,graspthemainfactors,soastohighlighttheessentialcharacteristicsofobjectivethings,thisiscalledbuildingaphysicalmodel.
Buildingaphysicalmodelisascientificthinkingmethodforstudyingphysicalproblems.
Middleschoolphysicsmodel
Physicsmodelsatthemiddleschoolstagecangenerallybedividedintothreecategories:materialmodels,statemodels,andprocessmodels.
Mattermodel
Materialscanbedividedintophysicalmatterandfieldmatter.(Ofcourse,inmodernphysics,thereareotherformsofmattersuchasdarkmatteranddarkenergy).
Physica materialia, ut: massas puncta inmechanicas, germina, elastica, etc., monstrant electra magnetica, parallelplata capacitores, prope vulnera solenoides, etc.
Fieldmattermodels, suchasuniformeselectricfield,uniformes,magneticfield,gravitatis, etc. areallmodels of spacefieldmater.
Statemodel
Inthestudyoffluidmechanics, fluxus stabilis, fluxi, instudiofidealgas, aequilibrium status thegas, in meditatione ofatomicphysicas, fundamenta thea- tomatis et status, etc., ad thestatemodel pertinent.
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.