初二物理液體壓強(qiáng)異形容器問題公開課一等獎?wù)n件省賽課獲獎?wù)n件

液體壓強(qiáng)重難點(diǎn)之

異形杯問題第1頁產(chǎn)生原因：液體受到重力作用，并且具有流動性公式：P=ρgh液體壓強(qiáng)第2頁好了，廢話不多說上圖第3頁如下列圖，在質(zhì)量不計、底面積相等甲、乙、丙三個容器中，裝入相同高度同種液體液體對容器底部壓強(qiáng)P甲

P乙

P丙液體對容器底部壓力F甲

F乙

F丙容器對桌面壓強(qiáng)P甲

P乙

P丙容器對桌面壓力F甲

F乙

F丙相同高度同種液體====＞＞＞＞第4頁如下列圖，在質(zhì)量不計、底面積相等甲、乙、丙三個容器中，裝入相同質(zhì)量液體液體對容器底部壓強(qiáng)P甲

P乙

P丙液體對容器底部壓力F甲

F乙

F丙容器對桌面壓強(qiáng)P甲

P乙

P丙容器對桌面壓力F甲

F乙

F丙相同質(zhì)量＜＜＜＜====第5頁如下列圖，在質(zhì)量不計、底面積相等甲、乙、丙三個容器中，裝入相同質(zhì)量不一樣液體并使液面在相同高度處液體對容器底部壓強(qiáng)P甲

P乙

P丙液體對容器底部壓力F甲

F乙

F丙容器對桌面壓強(qiáng)P甲

P乙

P丙容器對桌面壓力F甲

F乙

F丙相同高度相同質(zhì)量不一樣液體＜＜＜＜====第6頁總結(jié)一下先算壓強(qiáng)，后算壓力第7頁1.肯定式：①There______+a/an可數(shù)名詞單數(shù)/不可數(shù)名詞②There______+可數(shù)名詞復(fù)數(shù)There_____ahandsomemanintheclassroom.There___aneggonhishead.There___someorangejuiceintheglass.There______somelovelygirlsintheclassroom.第8頁Thereis_______Thereare_____第9頁2.否認(rèn)式：Therebe+not+主語+其他

There___________acomputerinmybedroom.=Thereisnocomputerinmybedroom.There__________anystudentsintheclassroom.=Therearenostudentsintheclassroom.nota/an=nonotany=no第10頁3.一般疑問句：①一般情況：將be動詞提前。②含情態(tài)動詞（如：will），則將情態(tài)動詞提前。

Thereissomemilkintheglass.

—Isthereanymilkintheglass?杯子里有牛奶嗎？肯定回答：—Yes,there_____.是，有。否認(rèn)回答：—No,there____________.不，沒有。

Therewillbeapartytomorrowevening.

—_____there______apartytomorrowevening?明晚將有一種派對嗎？肯定回答：—Yes,there_______.是，有。否認(rèn)回答：—No,there_________.不，沒有。

注意：some疑問變any第11頁4.therebe句型中對數(shù)量進(jìn)行提問

①

____________________對可數(shù)名詞復(fù)數(shù)進(jìn)行提問。

e.g.Therearefivebirdsinthetree.樹上有5只鳥。____________________arethereinthebirds?

②

____________________對不可數(shù)名詞進(jìn)行提問。e.g.Thereisalittlewaterinthebottle._____________________isthereinthebottle?第12頁練習(xí)一下（先熟悉筆記+后做題共7分鐘）單選（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頁()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頁完成句子1.Thereissomesoupinthebowl.（改為否認(rèn)句）(1)____________________________________soupinthebowl.(2)____________________________________soupinthebowl.2.Therearefourseasonsinayear.（改為一般疑問句，并作肯定回答）_________________________________________________inayear?Yes,____________________________.3.TherearefivepeopleinLily’sfamily.（對劃線部分進(jìn)行提問）____________________people____________________inLily’sfamily?第15頁考點(diǎn)來了Therebe肯否疑問Therebe就近標(biāo)準(zhǔn)第16頁Therebe是個近視眼第17頁若句子中有幾個并列主語時，be動詞形式要與離其近來一種主語在人稱和數(shù)上保持一致。就近標(biāo)準(zhǔn)第18頁Therebe是個近視眼第19頁There_____adeskandfifty-fivechairsintheclassroom.A.areB.is

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

第21頁選擇正確be動詞There_____anappleonthetable.桌子上有一種蘋果。There_______somewaterinthecup.杯子里有某些水。There_________fiveapplesonthetable.桌子上有五個蘋果。There_______oneboyandtwogirlsintheclassroom.教室里有一種男孩和兩個女孩。

There_________twogirlsandoneboyintheclassroom.教室里有兩個女孩和一種男孩練習(xí)一下（共4分鐘）第22頁單選（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頁易錯點(diǎn)注意！??！過去時

There_______acinemainourcitytwoyearsago.兩年前，我們都市有一家電影院。There_________manytreesherefiveyearsago.五年前，這里有很多樹。Therebe時態(tài)變化2.將來時

There_____________________________anEnglishpartynextSaturday.There_____________________________________aconcertthisSaturday.第24頁考點(diǎn)來了Therebe肯否疑問Therebe就近標(biāo)準(zhǔn)therebe和have區(qū)分第25頁Hehassomemoney.Thereissomemoneyonthetable.第26頁therebe表達(dá)存在，意為“某地/某時有……”經(jīng)常與地點(diǎn)狀語或時間狀語連用；Thereisameetingeveryevening.Therearesomelegsintheclassroom.have表達(dá)擁有，即“某人有……”Ihavearoundface.Mr.Wuhasasquareface.第27頁用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?練習(xí)一下第28頁考點(diǎn)來了Therebe肯否疑問Therebe就近標(biāo)準(zhǔn)therebe和have區(qū)分第29頁Let’spractice！練習(xí)一下第30頁單選(10道)（共10分鐘）()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頁()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．a(chǎn)nyB．someC．no第32頁完成句子1.Ihavethreecrayonsinmyschoolbag.（用therebe句型改寫成同義句）_______