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1、08高考物理命题热点解读08collegeentranceexaminationphysicspropositionhotspotanalysisChangzhouSeniorMiddleSchoolofJiangsuprovinceDingYuelinSection1.classicalmodelsandtherenovationofachangefulquestion1.[07Sichuan18].asshowninthefigure,oneendofthespringisfixedontheverticalwall,thequalityisa
2、smootharcgroovestaticminsmoothhorizontalplane,andthebottomlevelsmoothconnection,aqualityformtostartfromtheballslotfreefallCThemomentumoftheglobuleandthetrougharealwaysconservedinthecourseofthesubsequentmovementoftheA.IntheglidingprocessofB.,theinteractionbetweentheballandthegr
3、ooveisnotdoneatallWhentheC.isbouncedbythespring,boththeballandtheslotmoveatconstantspeedD.isthespringrebound,theballandgrooveoftheconservationofmechanicalenergy,theballbacktotankatChenquestion.[93nationalT12]smallblocksarelocatedonsmoothslopes,withslopeslocatedonsmoothhorizont
4、alground.Fromtheground,intheprocessofslidingdowntheslopeofasmallpieceofmaterial,itfacestheforceofasmallblock(A)workperpendiculartothecontactsurfaceandiszero(B)workperpendiculartothecontactsurfaceisnotzero(C)notperpendiculartothecontactsurface;zeroworkisdone(D)notperpendiculart
5、othecontactsurface;theworkdoneisnotzero2.[0720].Beijinghasalivesmallslideronasmooth,horizontalinsulatingsurfaceinvacuum.Atfirst,thesliderisstationary.IfahorizontaluniformelectricfieldE1isaddedinthespaceoftheslider,theuniformelectricfieldintheoppositedirectionofE1willbechangedi
6、mmediatelyafteraperiodoftimeE2.WhentheelectricfieldisE2.WhenthedurationoftheelectricfieldE1isthesame,thesliderreturnstoitsinitialpositionandhaskineticenergyEk.Intheaboveprocess,theelectricforceactingonthesliderofE1isW1,theimpulsesizeisI1;theelectricfieldforceactingontheslidero
7、fE2isW2,andtheimpulsemagnitudeisI2.CisdifficultA.I1=I2B.4I1=I2C.W1=0.25Ek,W2=0.75Ek,D.W1=0.20Ek,W2=0.80EkChenquestion.[95ShanghaiT5]abodyatrestonasmoothhorizontalplane,thefirstapplicationofaconstantF1leveltotherightoftheobject,thetimeaftertremovedF1,F2constantforitapplicationl
8、evelimmediatelytotheleft,andbythetimethetobjectbacktoitsstart
