Unit5Lesson25课件英语冀教版九年级全一册

Unit5Lesson25Let'sDoanExperiment!1.学习目标3.重点探究2.自主学习学习导航5.当堂检测6.课堂总结4.拓展提升

新课导入(1)Doyoulikescience?(2)Whatkindsofexperimentshaveyoudoneinscienceclass?(3)Ifyouholdajarthatisfilledwithwaterupsidedown,whatwillhappen?学习目标1.掌握本课新单词:science,experiment,fill,prove,scientific,method.掌握本课短语:doanexperiment,fill…with,cover…with,turn…upsidedown,be(not)sure…2.增强对科学实验的兴趣自主学习experiment

jar

upside

scientific

methodpourcorrectraincoatforcepressureconclude实验;试验广口瓶;罐子上部;上边科学的方法;办法倒出；倾倒正确的；恰当的雨衣力量；迫使，强迫压力，压强；挤压得出结论；断定；推断出重点探究Thinkaboutit!1.Whatkindsofexperimentshaveyoudoneinscienceclass?2.Ifyouholdajarthatisfilledwithwaterupsidedown,whatwillhappen?

Danny,JennyandBrianareinthelab.Brian:Let'sdoanexperiment.Ifillajarwithwater.Icoverthetopwithapieceofcardboardandholditthere.ThenIturnthejarupsidedownandtakemyhandoffthecardboard.Canyouguesswhatwillhappen?Danny:Ithinkthefloorwillgetwet.Weshoulddothisexperimentoutside,Brian.Jenny:Ithinkthecardboardwillholdthewater.Danny:Idon'tthinkso.Jenny:Youthinkthewaterwillpourout,Danny.Ithinkthewaterwillstayinthejar.Let'stestwhichtheoryiscorrect.Brian:Goodidea,Jenny.That'scalledthescientificmethod.Jenny:IamsosureofmytheorythatBriancandotheexperimentoveryourheadandIknowyouwon'tgetwet.Danny:Well,let'stryit!Brian:Areyouready,Danny?Danny:No!Wait!(Heputsonaraincoatandsitsdown.)Now,IthinkI'mready.Jenny:Brian,takeyourhandoffthecardboard.Danny:No!(Dannycloseshiseyestightly,andBriantakeshishandoffthecardboard.Thewaterstaysinthejar:)Jenny:See,Danny!Danny:Howisthatpossible?Brian:Theforceoftheairkeepsthewaterinthejar.Itisstrongenoughtoholdthewater.Danny:Wow!Brian:Sowhathavewediscovered?Jenny:Wehavediscoveredthattheairpressurehelpsthecardboardholdthewaterinthejar.Brian:Right.Whatdoyouconclude,Danny?Danny:IconcludethatairisstrongerthanIthought.(1)WheredoesDannythinktheyshoulddotheexperiment?

Hethinkstheyshoulddotheexperimentoutside.(2)Whatkeepsthewaterinthejar?Theforceoftheair.(3)IsJennysureofhertheory?Howdoyouknow?Yes,sheis.BecausesheissosureofhertheorythatBraincandoit.(4)WhydoesDannyputonhisraincoat?Inordernotto

getwet.(5)WhatdoesDannyconclude?Heconcludedthatairisstrongerthanhethought.1Readthedialoguewiththefollowingquestions.Let'sDoIt!2Readtheexperiment.Putthesentenceinthecorrectorderonpage67.251346Let'sDoIt!Putapieceofcardboardoverthejar.Thejarofwaterisupsidedown,butthewaterstaysinthejar.Thisisbecauseairpressurepushesthecardboardontothejar.Filltheglassjarwithwater.Turntheglassjaroverquickly.Holdyourhandonthecardboardforafewseconds.Removeyourhandfromunderneaththejar.Whathappens?Thereismoreairoutsidethejarthaninside,sothereismoreairpressureoutsidethaninside.Tasktips:Whathappenswhenyouuselesswater,morewater,wetcardboard,ordifferentkindsandsizesofjars?Let'sDoIt!3Trytodotheexperimentinthislessonyourself.WhatIsScience?Whatisscience?Canyouexplain?Pleasemakeiteasyformybrain.It’saboutmakingobservations.Whydoonionsmakemecry?It’saboutmatter—theuniverse.Whydocloudsgoby?Whydoesacarstayontheroad?Whatkeepsthebirdsinthesky?Whyistheregreenalloveratoad?That’sjustscience.Whycan’tcarryaheavyload?That’sjustscience.Let'sDoIt!4Listenandsingalong.拓展提升1.ThenIturnthejarupsidedownandtakemyhandoffthecardboard.◆turn…upsidedown意为“把……翻转/倒过来”,相当于turnover。upsidedown意为“正面朝下”。rightsideup意为“正面朝上”。◆take…off…在本句中意为“使……离开/脱离……”或“把……从……拿开”。【拓展】takeoff意为“摘掉,(飞机)起飞,脱掉”。getwet意为：变湿get在本句中是系动词，意为“变得”后接形容词作表语2.Ithinkthefloorwillgetwet.拓展：getalongwith与…….相处getaway离开，逃脱getback取回，回来，报复getoff下车，动身3.besureof

意为“确信；对……有把握”。

4.puton意为“穿上”。“动词+副词”构成的短语。

e.g.Iamsureofthefact.我确信这个事实。

5.pourout：“倒出，使流出，涌出”。

pour…into…：“把……倒进……”。6.Itis+形容词+enoughtodosth.”“做某事是足够……的”。

=too…to…=so…that…

e.g.:Heistoooldtogotoschool.7.concludefrom意为“从……推断，从……中得出”。e.g.:Whatdoyouconcludefromthem?你能从中得到什么结论？

当堂检测一、用适当的介词填空。1.Thebookiscovered_______apieceofredpaper.2.Astrangethinghappened______himlastweek.3.TVisanotherway______sayingtelevision.4.Dave,pleasefillthejar______wateratfirst.5.Haveyouread______theearthquakeinthenewspaper?withtoofwithabout二、根据句意及首字母或汉语提示补全单词。1．It’sthebestm________ofworkingoutthemathproblem.2．I’msurethatthef________oftheairwillkeepthewaterinthejar.3．Canyouhelpmec________themistakethatyoufind?4．Putonthe________(雨衣)forit's