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1、物理问答题解题基本方法及试题操练Oneofthecharacteristicsofjuniormiddleschoolphysicstextbooksisthatthereisalotofqualitativeknowledge・Thiscaneffectivelytrainthestudents'reasoning,analysisabilityandwrittendescriptionandsummarizingability.Thiskindofproblemismostlyaboutthepracticeofliv
2、ingarelevantphysicalphenomenaandphysicalconceptsandlawsofphysics,〃why,whatis〃，"testinstructions,pleaseexplain"andotherwaystoaskquestions,requeststhestudenttousephysicalknowledgetoanswer・Forjuniorhighschoolstudents,itisoftenimpossibletoexpressphysicalmeaningandsubs
3、taneeintheexactIanguageofthepreciselanguage,oftenwithnofocus,irrelevantanswer・Theteachershouldstrengthenthetrainingtothestudents,andgraduallygraspthemainpointsandtheideasofsolvingsuchproblemsets,andfinallyachieveagoodresult・One,thegeneralideaofthesolutionquestion1
4、.Serioustopiccleartitlegivenphysicalphenomenonandtheprocess,findouttheknownconditionsandphysicalproblemstoanswer・Whentheboatsailedfromtherivertothesea,didtheshipsinkorfloat?Whyisthat?Answermethods:expressionofphysicalphenomenonandtheprocessistheshipvoyagefromtheri
5、vertothesea,bytheanalysis,findouttheknownconditionsarethesameobject,floatinginthetwodifferentdensityofliquids・Thequestiontobecleariswhethertheshipsinksorrises・Tofindoutthebasisoftheansweristoidentifythephysicalorphysicallawsthatexistbetweentheknownconditionandtheq
6、uestionthatistobeanswered・Inthelastcase,thestudentwantedtomakeitclearthattheconditionoftheobjectfloatingintheliquidsurfacewastheFfloat二G,thesecondforceequilibrium.3.reasoningstatedaccordingtophysicalphenomenaandprocesses,startingfromtheknownconditions,fullyrevealt
7、hetheoryaccordingtothelogicrelationbetweenandhavetoanswerthisquestion,withrefinedlanguage,clearlogicalreasoning・Suchas,duetotheshipontheroadweightremainsthesame,andsinceitisfloatingintheliquidsurface,accordingtotheconditionFfloatingonthesurfaceoftheobjectfloatingi
8、ntheliquid二G,2forcebalance,cangetrhorivergVrow1二G二rhoseagVrow2,name1ytherhorivergVrow1二rhoseagVrow2,becauserhoriverrow1>
