初二物理液体压强异形容器问题公开课一等奖课件省赛课获奖课件

液体压强重难点之

异形杯问题第1页产生原因：液体受到重力作用，并且具有流动性公式：P=ρgh液体压强第2页好了，废话不多说上图第3页如下列图，在质量不计、底面积相等甲、乙、丙三个容器中，装入相同高度同种液体液体对容器底部压强P甲

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P丙液体对容器底部压力F甲

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F丙容器对桌面压强P甲

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P丙容器对桌面压力F甲

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F丙相同高度同种液体====＞＞＞＞第4页如下列图，在质量不计、底面积相等甲、乙、丙三个容器中，装入相同质量液体液体对容器底部压强P甲

P乙

P丙液体对容器底部压力F甲

F乙

F丙容器对桌面压强P甲

P乙

P丙容器对桌面压力F甲

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F丙相同质量＜＜＜＜====第5页如下列图，在质量不计、底面积相等甲、乙、丙三个容器中，装入相同质量不一样液体并使液面在相同高度处液体对容器底部压强P甲

P乙

P丙液体对容器底部压力F甲

F乙

F丙容器对桌面压强P甲

P乙

P丙容器对桌面压力F甲

F乙

F丙相同高度相同质量不一样液体＜＜＜＜====第6页总结一下先算压强，后算压力第7页1.肯定式：①There______+a/an可数名词单数/不可数名词②There______+可数名词复数There_____ahandsomemanintheclassroom.There___aneggonhishead.There___someorangejuiceintheglass.There______somelovelygirlsintheclassroom.第8页Thereis_______Thereare_____第9页2.否认式：Therebe+not+主语+其他

There___________acomputerinmybedroom.=Thereisnocomputerinmybedroom.There__________anystudentsintheclassroom.=Therearenostudentsintheclassroom.nota/an=nonotany=no第10页3.一般疑问句：①一般情况：将be动词提前。②含情态动词（如：will），则将情态动词提前。

Thereissomemilkintheglass.

—Isthereanymilkintheglass?杯子里有牛奶吗？肯定回答：—Yes,there_____.是，有。否认回答：—No,there____________.不，没有。

Therewillbeapartytomorrowevening.

—_____there______apartytomorrowevening?明晚将有一种派对吗？肯定回答：—Yes,there_______.是，有。否认回答：—No,there_________.不，没有。

注意：some疑问变any第11页4.therebe句型中对数量进行提问

①

____________________对可数名词复数进行提问。

e.g.Therearefivebirdsinthetree.树上有5只鸟。____________________arethereinthebirds?

②

____________________对不可数名词进行提问。e.g.Thereisalittlewaterinthebottle._____________________isthereinthebottle?第12页练习一下（先熟悉笔记+后做题共7分钟）单选（7道）()1.There___________somebooksonthesofa.A.has B.is C.have D.are()2.—___________childrenarethereinthepark?—Therearetwelvechildreninthepark.A.Howmany B.Howmuch C.Hownumber D.Whatmany()3.—_________thereanyjuiceinyourglass?—No,__________.A.Are;therearen’tB.Is;thereisn’tC.Are;therenotD.Is;therenot()4.There_________abigtreenearmyhouselastyear.A.is B.are C.was D.were第13页()5.—Willtherebeabirthdaypartyforyounextweek?—Yes,_________.A.thereis B.will C.therebe D.therewill()6.There________anyfoodinthekitchen.A.isn’t B.is C.are D.aren’t()7.There__________twocupsofteaonthetable.A.is B.are C.have D.has第14页完成句子1.Thereissomesoupinthebowl.（改为否认句）(1)____________________________________soupinthebowl.(2)____________________________________soupinthebowl.2.Therearefourseasonsinayear.（改为一般疑问句，并作肯定回答）_________________________________________________inayear?Yes,____________________________.3.TherearefivepeopleinLily’sfamily.（对划线部分进行提问）____________________people____________________inLily’sfamily?第15页考点来了Therebe肯否疑问Therebe就近标准第16页Therebe是个近视眼第17页若句子中有几个并列主语时，be动词形式要与离其近来一种主语在人称和数上保持一致。就近标准第18页Therebe是个近视眼第19页There_____adeskandfifty-fivechairsintheclassroom.A.areB.is

第20页There_____fifty-fivechairsandadeskintheclassroom.A.areB.is

第21页选择正确be动词There_____anappleonthetable.桌子上有一种苹果。There_______somewaterinthecup.杯子里有某些水。There_________fiveapplesonthetable.桌子上有五个苹果。There_______oneboyandtwogirlsintheclassroom.教室里有一种男孩和两个女孩。

There_________twogirlsandoneboyintheclassroom.教室里有两个女孩和一种男孩练习一下（共4分钟）第22页单选（4道）()1.—What’sinyourbedroom?—There_________acomputer,twochairsandabookshelfinmyroom.A.are B.be C.has D.is()2.__sometoysandabookontheshelf.A.Thereare B.Thereis C.Therewas D.Therewere()3.______somemilkandaneggonthetable.A.Thereare B.Thereis C.Therewas D.Therewere()4._______anorangeandtwoapplesinthebasket.A.Thereare B.Thereis C.Therewas D.Therewere第23页易错点注意！！！过去时

There_______acinemainourcitytwoyearsago.两年前，我们都市有一家电影院。There_________manytreesherefiveyearsago.五年前，这里有很多树。Therebe时态变化2.将来时

There_____________________________anEnglishpartynextSaturday.There_____________________________________aconcertthisSaturday.第24页考点来了Therebe肯否疑问Therebe就近标准therebe和have区分第25页Hehassomemoney.Thereissomemoneyonthetable.第26页therebe表达存在，意为“某地/某时有……”经常与地点状语或时间状语连用；Thereisameetingeveryevening.Therearesomelegsintheclassroom.have表达拥有，即“某人有……”Ihavearoundface.Mr.Wuhasasquareface.第27页用therebe或have/has填空1.I________agoodfatherandagoodmother.2.____________aTiaonthedesk.3.He_________aniPad.4._____________abasketballontheplayground.5.She__________somedresses.6.They___________anicegarden.7.Whatdoyou___________?8.______________areading-roominthebuilding?9.WhatdoesMike___________?10.______________anybooksinthebookcase?练习一下第28页考点来了Therebe肯否疑问Therebe就近标准therebe和have区分第29页Let’spractice！练习一下第30页单选(10道)（共10分钟）()1.Jack_______abigschoolbag.____________manypencilsinit.A.has;ThereisB.have;ThereareC.has;ThereareD.have;Thereis()2.Arethereanymapsonthewall?___A.Therearesome.B.Yes,thereis.C.Yes,thereisone.D.No,thereare.()3.Howmany____arethereinthepicture?A.womanB.womenC.buyD.milk()4.Therearen't___treesnearthehouse.Thereisonlyone.A.anyB.someC.manyD.much()5.There___twobowlsofriceonthetable.A.isB.haveC.hasD.are第31页()5.Arethere___housesneartheriver?Yes,thereare_______.

A.some,someB.any,someC.any,anyD.some,any

()______nocoffeeleftyesterday.A.ItbeingB.TherebeingC.ItwasD.Therewas

()7.Therearefew_____inthefridge．Let'sgoandbuysomepeasandcabbages．

A．vegetablesB．fruitC．meatD．eggs

()8.Look！Therearesome_____onthefloor．

A．childB．waterC．boxesD．girl

()9．There_____afootballgameinourschool．A．hasB．willhaveC．willbe

()10．Thereis_____foodhere．We'llhavetobuysome．A．anyB．someC．no第32页完成句子1.Ihavethreecrayonsinmyschoolbag.（用therebe句型改写成同义句）_______