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1、汽车启动问题Fourth,lookatimage,chaseandproblemPoint1,understandingandapplicationofmotionpictureThecomparisonofthestimagewiththevtimageFigurelineofthesameshape,indifferentimagerepresentsdifferentphysicalsignificanee,throughtheexampleinfigureexperiencestimagesandvtimage
2、centerlineshowsthephysicalsignificance・Thes~timage[see[a]]・V-timage[b]](slopeisaccelerationa)；ItmeansthatanobjectdoesauniformlinearmotionTosaythattheobjectisstill;Itmeansthattheobjectmovesinastraightlineintheoppositedirection;Theverticalcoordinatesoftheintersect
3、ingpointsrepresentthedisplacementofthethreemovingobjectswhentheymeet;Attl,theobjectdisplacementissi(theareaoftheshadedareaismeaningless)Toindicatethatanobjectdoesauniformlinearmotion;Thismeansthattheobjectdoestheuniformlydeceleratinglinearmotion;Theverticalcoord
4、inatesoftheintersectionsrepresentthesamevelocityofthethreemovingobjects;Attimetl,theobjectvelocityisvl(theareaoftheshadedregionofthegraphrepresentsthedisplacementoftheobjectintime0totl).[example1](fujianquanzhoufourcollegeentranceexaminationin2010)asshowninfigur
5、eisacardolinearmotion,s-timagetosegmentthe0A,AB,BC,CDsaidmovement,thefollowingistrue()A.o.AisthemostmovingTheB.AsegmentcardoesauniformmotionThecDsegmentmovesintheoppositedirectionoftheinitialmotionThedisplacementofthe4hcaris30km【11】fortrainingthehefeisimulation[
6、2010]ballsintheairbystaticbegantofall,andthehorizontalgroundtouchingoneanotherandthenrosetoacertainheight,thespeedofitsmovement-timeimageasshown.G=10m/s2,knownbyafigurethe()A.Theaccelerationoftheballfallingis10m/s2B.Theballstartsataheightof2mfromthegroundA.Thepa
7、thoftheprocessis1.375mB.Theaccelerationoftheballintheascentisgreaterthan12m/s2Intraining12】【quanzhouoffujianprovinceonefinalexam(2010)aclassmatetowalkalongastraightline,stroboscopicphotographywithhimtorecordhiswalkinthepositionofthenineconsecutiveimages,asshowni
8、nfigure(a).Watchpictures,infigure(b)speed-timeimagecomparisoncancorrectlyreflectthestudentsmovementis()TheanalysisoftheproblemofmeetingandmeetingThespeedofthechaseand
