九年级英语上册Unit5LookintoScienceLesson25LetsDoanExperiment冀教版.ppt

Lesson25,Unit5LookintoScience,5,Unit,Lesson25LetsDoanExperiment！,学习目标,objectives,Thenewwords:experiment,jar,upside,pour,correct,scientific,method,raincoat,force,pressure,concludeTounderstandthetheoryoftheexperiment.Tolearnactively.,Words,experimentjarupsidepourcorrectscientific,n.实验；试验n.广口瓶；罐子n.上部；上边v.倒出；倾倒adj.正确的；恰当的adj.科学的,Words,methodraincoatforcepressureconclude,n.方法；办法n.雨衣n.力量v.迫使；强迫n.压力；压强；挤压v.得出结论；推断出,Leadin,Discuss,Doyouliketodoexperiments?Whatexperimentshaveyoudone?,Listentothetapeandanswerthefollowingquestions.,1.WhatsDannystheory?2.WhatsJennystheory?,Dannythinksthefloorwillgetwet.,Jennythinksthewaterwillstayinthejar.,Pre-reading,While-reading,Readthelessonandanswerthequestions.,1.WheredoesDannythinktheyshoulddotheexperiment?2.Whatkeepsthewaterinthejar?3.IsJennysureofhertheory?Howdoyouknow?,Hethinkstheyshoulddoitoutside.,Theforceoftheair.,Yes,sheis.ShethinksthatBriancandotheexperimentoverDannyshead.,4.WhydoesDannyputonhisraincoat?5.WhatdoesDannyconclude?,Hethinksthewaterwillpourout.,Theairisstrongerthanhethought.,Ifillajarwithwater.我用水把瓶子装满。fillwith用装满Hehasfilledhiscasewithmanybooks.他已经把书装满了箱子。coverwith用盖住,LanguagePoints,2.Iturnthejarupsidedown.我把广口瓶倒置。,upsidedown“向下翻转过来”.Youholdthebookupsidedown.你把书拿倒了。rightsideup“正面朝上”,besure+that从句表示“认为一定”而benotsure表示不确定.,e.g.Imsureshewillcomehere.我确信她会来。Imnotsurewhenhellcomehere.我不能肯定什么时候来这儿。,Imsurethefloorwontgetwet.我确信地板不会湿。,4.Welldotheexperimentandobservedwhatwillhappen.我们将做这个实验并观察会发生什么情况。observed动词,“观察”。observesb.do/doingsth.e.g.Iobservedherdance.WhenIpassedbythegrass,Iobservedhimwalking.,1.Letsdotheeandseewhathappens.2.A“t”isanideaandpredictswhatwillhappen.3.Wecanpwhosright.4.Turnthejarudownandwecanseewhatwillhappen.5.“O”isanotherwayofsaying“watchcarefully”.,xperiment,heory,rove,pside,bserve,Letsdoaninterestingexperiment.First,I_ajar_adesk,_it_water,then_thetop_apieceofcardboard.WhenI_thejar_,canyouguesswhatwillhappen?,put,on,fill,with,cover,with,turn,upside,down,Howdowedotheexperiment,Post-reading,LetsDoIt!,Inasmallgroup,trytheexperimentabove.Tryitwiththejarfull.Tryitagainwiththejarnearlyempty.Writedownyourobservations.Didtheexperimentwork?Didanyonegetwet?,Aballoonisfullofair.Ifwepierce(刺破)itwithaneedle,itwillbreakwithaloudbang.Butifweputapieceofglueontheballoonanddothesameexperiment,whatwillhappen?Surprisingly,wewonthearthesamesound.Theballoonwillbecomesmallerandsmaller.Wewillfeelthattheairisrunningoutslowlythroughthepinhole(针孔).Weknowtheballoonismadeof,AnExperimentaboutaBalloon,rubber(橡胶).Whentheballoonispierced,theairleavingtheballoonformsakindofforce.Rubberissothinthatitcantsupport(支撑)suchforce.Sotheballoonbreaksquicklywithaloudbang.Buttheglueisdifferent.Itsstrongenoughtosupporttheforceoftheair.Peoplehavelearnedsomethingfromthisexperiment.Theyhaveusedthismethodtomaketires(轮胎).,AnExperimentaboutaBalloon,I.根据汉语或首字母提示，完成下列句子。,1.Itisthebest_(方法)ofworkingoutthemathproblem.2.Haveyouheardofthe_(理论）before?3.Mydaughterlikes_(科学)morethanEnglish.4.Youransweriswrong,andwecandoanexperimenttop_it.5.Dontturnthebottleu_down.Itstoodangerous.,pside,method,theory,science,rove,Practice,1.Helockedthedoor_(careful)beforeheleft.2.Lets_(finish)theworktogethernow.3.Canyouguesswhat_(happen)in100years?4.Whatsanotherwayof_(say)“autumn”?,saying,II.用所给单词的适当形式填空。,carefully,finish,willhappen,1.我确信你是一个诚实的人。I_thatyouareanhonestman.2.请用一块玻璃盖上那个杯子。Please_thecup_apieceofglass.3.小心，否则你会弄湿的。Becareful,oryoull_.4.把箱子倒