高中英语 unit4 Astronomy speaking教案 新人教版必修3 教案 11页

河北省石家庄市第一中学高中英语unit4Astronomyspeaking教案新人教版必修3教材章节Unit4课题Astronomy课型Speaking教学目标知识与能力知识内容preparation,instruction,unexpected,asetof,payattentionto,aswellas等级水平(A)识记(B)理解(C)应用(D)分析(E)综合(F)评价能力目标a.EnabletheSstomakealistofthingsthattheyneed.b.EnabletheSstotalkaboutgivinginstructions.c..EnabletheSstoplaydifferentrolesinaconversation.过程与方法a.Pairsworkandgroupworkb.Discussionandcooperativelearning情感态度与价值观a.LearnhowtomakealistofthingsthattheyneedbHelptheSslearnhowtotalkaboutgivinginstructionsc.EnabletheSslearnhowtoplaydifferentrolesinaconversation教学设计重点难点分析a.TeachtheSshowtohowtotalkaboutgivinginstructionsb.HelptheSstolearnhowtoplaydifferentrolesinaconversation.教学技术设备1Acomputer2Aprojector教学环节学习目标1、学习的主要知识speaking2、需要掌握的方法Discussionandcooperativelearning课题概述1、本节知识的主要意义Knowmoreaboutastronomy2、本节知识在知识体系中的地位和联系Learnhowtotalkaboutgivinginstructions石家庄市第一中学教案教学环节分析讲解学生活动设计\nStepIRevisionAsksomeoftheSstoreadhis/herpassageaboutgravity.Onepossiblepassage:SirIsaacNewton:TheUniversalLawofGravitation ThereisapopularstorythatNewtonwassittingunderanappletree,anapplefellonhishead,andhesuddenlythoughtoftheUniversalLawofGravitation.Asinallsuchlegends,thisisalmostcertainlynottrueinitsdetails,butthestorycontainselementsofwhatactuallyhappened.WhatReallyHappenedwiththeApple?ProbablythemorecorrectversionofthestoryisthatNewton,uponobservinganapplefallfromatree,begantothinkalongthefollowinglines:Theappleisaccelerated,sinceitsvelocitychangesfromzeroasitishangingonthetreeandmovestowardtheground.Thus,byNewton's2ndLawtheremustbeaforcethatactsontheappletocausethisacceleration.Let'scallthisforce"gravity",andtheassociatedaccelerationthe"acclerationduetogravity".Thenimaginetheappletreeistwiceashigh.Again,weexpecttheappletobeacceleratedtowardtheground,sothissuggeststhatthisforcethatwecallgravityreachestothetopofthetallestappletree.Discussionandsummary\nSirIsaac'sMostExcellentIdeaNowcameNewton'strulybrilliantinsight:iftheforceofgravityreachestothetopofthehighesttree,mightitnotreachevenfurther;inparticular,mightitnotreachallthewaytotheorbitoftheMoon!Then,theorbitoftheMoonabouttheEarthcouldbeaconsequenceofthegravitationalforce,becausetheaccelerationduetogravitycouldchangethevelocityoftheMooninjustsuchawaythatitfollowedanorbitaroundtheearth.Thiscanbeillustratedwiththethoughtexperimentshowninthefollowingfigure.Supposewefireacannonhorizontallyfromahighmountain;theprojectilewilleventuallyfalltoearth,asindicatedbytheshortesttrajectoryinthefigure,becauseofthegravitationalforcedirectedtowardthecenteroftheEarthandtheassociatedacceleration.(Rememberthatanaccelerationisachangeinvelocityandthatvelocityisavector,soithasbothamagnitudeandadirection.Thus,anaccelerationoccursifeitherorboththemagnitudeandthedirectionofthevelocitychange.)\nButasweincreasethemuzzlevelocityforourimaginarycannon,theprojectilewilltravelfurtherandfurtherbeforereturningtoearth.Finally,Newtonreasonedthatifthecannonprojectedthecannonballwithexactlytherightvelocity,theprojectilewouldtravelcompletelyaroundtheEarth,alwaysfallinginthegravitationalfieldbutneverreachingtheEarth,whichiscurvingawayatthesameratethattheprojectilefalls.Thatis,thecannonballwouldhavebeenputintoorbitaroundtheEarth.NewtonconcludedthattheorbitoftheMoonwasofexactlythesamenature:theMooncontinuously"fell"initspatharoundtheEarthbecauseoftheaccelerationduetogravity,thusproducingitsorbit.Bysuchreasoning,NewtoncametotheconclusionthatanytwoobjectsintheUniverseexertgravitationalattractiononeachother,withtheforcehavingauniversalform:\nTheconstantofproportionalityGisknownastheuniversalgravitationalconstant.Itistermeda"universalconstant"becauseitisthoughttobethesameatallplacesandalltimes,andthusuniversallycharacterizestheintrinsicstrengthofthegravitationalforce.StepIIPresentationT:DoyouremembertheconversationbetweenLiYanpingandProfessorWallis?S1:Yes.T:Weallknowthatspacewalkisdifficultanddangerous.Whatshouldanastronauttakewithhim?S2:oxygencan.S3:spacesuit.\nS4:gravityboots.S5:watersystem.S6:specialfood.S7:specialropes.T:Great!Doyouknowtheusageofthem?NowdiscussthemwithyourpartneraccordingtotheformonPage31.YoucanrefertoourlisteningmaterialonPage65.WhenSsdiscuss.Teacherwalkaroundtheclassroomtogivethemsomehelp.StepIIISpeaking(Page31)(Afterafewminutes.)T:Haveyoufinished?Nowspeakoneortwosentencesforeachequipmentyoushouldtake.Sa:Iwilltakewaterwithmeinmyspacesuitinordertowarmorcoolmeifit’stoocoldortoohot.Sb:Iwilltakeoxygencanonmybackinordertohelpmebreatheoxygeninspace.Sc:I’llwearspacesuit.tcanprotectmefrommanydangers.Itcancarrymanynecessarythingsinoronit.Sd:I’lltakespacebuggyinordertotravelonthemoon.Se:I’lltakearopetotiemetothespaceship,orI’llflyaway.Sf:I’lltakespecialfoodsothatIcaneateasily,becausethefoodwillfloatinspace.Sg:I’llwearspecialsunglassesinordertoprotectmyeyes.\nSh:I’lltakespacecamerainordertotakephotos.T:Wonderful!Anythingelse?Si:I’llwearspacebootsinordertowalkthere.T:Verygood.You’vedoneanexcellentjob!Doyouknowhowtofillintheformnow?Ss:Yes.T:Nowlookatthescreenandcheckyouranswer.Sampleanswer:TokeepyoucoolSpaceshipwithwatertocoolyoutohelpyoubreatheoxygenOxygentankstocarryonyourbackClothesforexercisespacesuitTotravelonthemoonSpacebuggyToprotectyourskinSpacesuitTostopyouflyingoffintospaceAropetotieyoutothespaceshipTostopyourfoodfromfloatingawaySpacefoodthatyoucaneatmoreeasilyClothesforwalkingonthemoonSpacesuitTogiveshadeSunglassesinyourspacesuithelmet\nTotakephotographsSpacecameraStepIVTalking(Page62)Thetaskasksthestudentstoworkinpairsandgiveafriendanumberof“does”and“don’ts”forgoingintospace.Theyneedtomakesuggestionsusingthephrasesthattheyhavebeengiventohelpthem.Whentheyhaveworkedouttheadvicetheycanwritethesuggestionsdownandreadthemouttotheclass.ShowtheusefulexpressionsPleaselookat/listento…Pleasecheckthat…Youneed…Pleasepayattentionto…Don’tforgetto…You’dbetter…Makesureyou…Watchoutfor…Youmustn’t…T:Nowdiscussitinpairs.ThenIwillasksomepairstoreadouttheirinstructions.Sampledialogue:S1:I’mgoingtovisitacomet.I’mleavingtomorrow.S2:Howexciting!Pleasecheckthatyouhavegotthecorrectsortofspacesuit.Youneedthekindthatwillkeepyouwarmifit’stoocold.S1:Ofcourse!S2:Makesureyouknowallthesafetyrules.It’snotsafetostand\nonacometorgettooclose.Thereisalwaysastrongwindinspace.S1:Iwon’tleavethespaceshipexceptthatItakephotos.S2:Photos?Justthinkofthedustintheair.Itwillmaketakingphotosverydifficult.S1:Well,I’lltakesomeanyway.S2:Watchoutforthespacewind!Itcanbeverydangerous.S1:Yes,Iknowthat.S2:Don’tforgettowatchthetimeasyouleavetheearth.Pleasepayattentiontoeverythingyourspaceguidesays.Don’tgooffonyourown.Lookatyourtemperatureonyourspacesuitallthetime.Ifit’stoolowyouneedtowarmitupandifit’stoohighyouneedtocoolitdown.Anyway,haveagoodtrip!S1:Thankyou.Iwill.StepVSpeakingTask(Page67)Thepurposeofthistaskistousetheinformationthestudentshavegainedfromthelisteningtextandreadingpassageinanewsituation.Theyaregoingtointerviewtheastronomerinourstory,LiYanping,foranewspaper.Soinpairstheneedtoworkoutsomequestionstoaskhim.Eachofthepairsneedstothinkofthreedifferentquestions.Andtrytofindtheanswers.Questionsandanswers:1.Whatwasthemostunexpectedthingyoufoundoutaboutblackholes?Theblackholethrewoutmaterialaswellasateobjects.2.Howdidyouknowyouhadgotclosetoablackhole?Youcanseethingsdisappearintowhatappearstobeanemptyspace.That’sablackhole.3.Whatwasthemostfrighteningthingthathappenedtoyouonthis\njourney?Whenthegravityoftheblackholewaspullingustoit’smouth,andthenthespaceshipmovedroundtheholeandbegantogofasterandfasterintoit;IwasterrifiedbecauseIthoughtwewouldbeeatenbythehole.4.Whydidyourwatchmoveslowerwhenyourspaceshipmovedaroundthehole?I’mnotclearyet.5.Haveyoufoundsomethingnewaboutblackholes?Yes.Ithoughtblackholesonlyeatsomeobjects,butinfacttheyalsospitobjectsout.石家庄市第一中学教案当堂训练WorkbookP62Talking\n课堂小结Learningaboutspeakingskillsandpracticemakesperfect.Makeaconversationusingphrasesandsentencestructures.课后作业Prepareforwritingapassageaboutyourideaorhopesfortravelinginspace.板书设计Pleaselookat/listento…Pleasecheckthat…Youneed…Pleasepayattentionto…Don’tforgetto…You’dbetter…Makesureyou…Watchoutfor…Youmustn’t…教学反思