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1、Unit4Astronomy:thescienceofthestarsTeachinggoals教学目标1Targetlanguage目标语言a重点词汇和短语preparation,instruction,unexpected,asetof,payattentionto,aswellasb交际用语PracticegivinginstructionsPleaselookat/listento…Pleasecheckthat…Youneed…Pleasepayattentionto…Don’tforgetto…You’dbette
2、r…Makesureyou…Watchoutfor…Youmustn’t…2Abilitygoals能力目标a.EnabletheSstomakealistofthingsthattheyneed.b.EnabletheSstotalkaboutgivinginstructions.c..EnabletheSstoplaydifferentrolesinaconversation.3Learningabilitygoals学能目标a.LearnhowtomakealistofthingsthattheyneedbHelpthe
3、Sslearnhowtotalkaboutgivinginstructionsc.EnabletheSslearnhowtoplaydifferentrolesinaconversation.Teachingimportantanddifficultpoints教学重点难点a.TeachtheSshowtohowtotalkaboutgivinginstructionsb.HelptheSstolearnhowtoplaydifferentrolesinaconversation.Teachingmethods教学方法a.Pa
4、irsworkandgroupworkb.DiscussionandcooperativelearningTeachingaids教具准备1Acomputer2AprojectorTeachingprocedures&ways教学过程与方式StepIRevisionAsksomeoftheSstoreadhis/herpassageaboutgravity.Onepossiblepassage:SirIsaacNewton:TheUniversalLawofGravitationThereisapopularstorythat
5、Newtonwassittingunderanappletree,anapplefellonhishead,andhesuddenlythoughtoftheUniversalLawofGravitation.Asinallsuchlegends,thisisalmostcertainlynottrueinitsdetails,butthestorycontainselementsofwhatactuallyhappened.WhatReallyHappenedwiththeApple?Probablythemorecorre
6、ctversionofthestoryisthatNewton,uponobservinganapplefallfromatree,begantothinkalongthefollowinglines:Theappleisaccelerated,sinceitsvelocitychangesfromzeroasitishangingonthetreeandmovestowardtheground.Thus,byNewton's2ndLawtheremustbeaforcethatactsontheappletocausethi
7、sacceleration.Let'scallthisforce"gravity",andtheassociatedaccelerationthe"acclerationduetogravity".Thenimaginetheappletreeistwiceashigh.Again,weexpecttheappletobeacceleratedtowardtheground,sothissuggeststhatthisforcethatwecallgravityreachestothetopofthetallestapplet
8、ree.SirIsaac'sMostExcellentIdeaNowcameNewton'strulybrilliantinsight:iftheforceofgravityreachestothetopofthehighesttree,mightitnotreacheven
