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冀教版九年级上册Lesson 25 Let’s Do an Experiment!课文课件ppt
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这是一份冀教版九年级上册Lesson 25 Let’s Do an Experiment!课文课件ppt，共24页。PPT课件主要包含了We need，Words and，Homework等内容，欢迎下载使用。
What experiments have yu dne?
Maybe we have dne……
D experiments in science class.
a piece f cardbard a jar sme water
fill the jar with watercver the tp with a piece f cardbardturn the jar upside dwnTake hand ff the cardbard
What will happen?
the flr will get wetthe water will pur ut
the air is strng t hld the water in the jar
Learning aims
1. The new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cnclude 2.T understand the thery f the experiment. 3.T learn actively.
experimentjarupsidepurcrrectscientific
n. 实验；试验n. 广口瓶；罐子n. 上部；上边v. 倒出；倾倒adj. 正确的；恰当的adj. 科学的
methdraincatfrcepressurecnclude
n. 方法；办法n. 雨衣n. 力量 v. 迫使；强迫n. 压力；压强；挤压v. 得出结论；推断出
Listen t the lessn and answer the fllwing questins.
1.What’s Danny’s thery? 2.What’s Jenny’s thery?3.What des Danny cnclude?
Danny thinks the flr will get wet.
Jenny thinks the water will stay in the jar.
Danny cncludes that air is strnger than he thught.
Read the lessn and answer the questins:1. Where des Danny think they shuld d the experiment? 2. What keeps the water in the jar? 3. Is Jenny sure f her thery? Hw d yu knw? 4. Why des Danny put n his raincat? 5. What des Danny cnclude?
The frce f the air.
He is afraid t get wet.
The air is strnger than he thught.
Yes, she is. She asks Brian t d the experiment ver Danny’s head and she knws he wn’t get wet.
Read and put the sentences in the crrect rder.
( )Put a piece f cardbard ver the jar.( )The jar f water is upside dwn , but the water stays in the jar .This is because air pressure pushes the cardbard nt the jar .( )Fill the glass jar with water.
( ) Turn the glass jar ver quickly .Hld yur hand n the card fr a few secnds.( ) Remve yur hand frm underneath the jar . What happens ?( ) There is mre air utside the jar than inside , s there is mre air pressure utside than inside .
Danny, Jenny and Brian are in the lab.Brian: Let’s d an experiment. I fill a jar with water. I cver the tp with a piece f cardbard and hld it there.Then I turn the jar upside dwn and take my hand ff the cardbard.Can yu guess what will happen?Danny: I think the flr will get wet.We shuld d this experiment utside, Brian.Jenny: I think the cardbard will hld the water.Danny: I dn’t think s.
fill …with… 用…装满… He has filled his case with many bks. cver…with… 用…盖住…I cver the tp with a piece f cardbard.
upside dwn “向下翻转过来”. Yu hld the bk upside dwn. 你把书拿倒了。right side up “正面朝上”
Jenny: Yu think the water will pur ut,Danny. I think the water will stay in the jar. Let’s test which thery is crrect.Brian: Gd idea, Jenny. That’s called the scientific methd.Jenny: I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.
be sure 表示肯定, 有把握,而be nt sure 表示不确定be sure/ be nt sure 后可接句子，还可接代词、名词、动名词或不定式。常见用法： be sure f sb / ding sth , be sure t d sth be sure that…
Danny: Well, let’s try it!Brian: Are yu ready, Danny?Danny: N! Wait!(He puts n a raincat and sits dwn.) Nw I think I’m ready.Jenny: Brian, take yur hand ff the cardbard.Danny: N！(Danny clses his eyes tightly, and Brian takes his hand ff the cardbard.The water stays in the jar)Jenny: See, Danny!Danny: Hw is that pssible?
意为“把从拿开”Please take yur hand ff the fd.take ff “摘掉，脱掉；起飞”When will the plane take ff?
Brian: The frce f the air keeps the water in the jar. It is strng enugh t hld the water.Danny: Ww!Brian: S what have we discvered?Jenny: We have discvered that the air pressure helps the cardbard hld the water in the jar.Brian: Right. What d yu cnclude,Danny？Danny: I cnclude that air is strnger than I thught..
enugh 的两种用法1.enugh 与修饰词的排队顺序:(1)作形容词时, 置于名词前、后均可 (2)作副词时, 置于所修饰的形容词、副之后2. enugh t d sth. 常与t. . . t或s. . . that进行句型转换Tm isn’t ld enugh t g t schl. →Tm is t yung t g t schl. →Tm is s yung that he can’t g t schl.
Try t d the experiment in this lessn yurself.
Task tips: What happens when yu use less water, mre water, wet cardbard, r different kinds and sizes f jars?
1. He lcked the dr ________ (careful) befre he left.2. Let's ______ (finish) the wrk tgether nw.3. Can yu guess what __________ (happen) in 100 years?4. What's anther way f _______ (say) “autumn”?
I. 用所给单词的适当形式填空。
will happen
1. 我确信你是一个诚实的人。I ______ ______ that yu are an hnest man.2. 请用一块玻璃盖上那个杯子。Please ______ the cup _____ a piece f glass.3. 小心，否则你会弄湿的。Be careful, r yu'll ______ ______.4. 把箱子倒过来，你会找到标签的。______ the bx _______ _______, then yu'll find the label.
II. 根据所给汉语意思翻译下列句子。
am sure
cver with
get wet
Turn upside dwn
1. Preview the wrds and expressins in Lessn 26.2. Finish the exercise f this lessn.
What experiments have yu dne?
Maybe we have dne……
D experiments in science class.
a piece f cardbard a jar sme water
fill the jar with watercver the tp with a piece f cardbardturn the jar upside dwnTake hand ff the cardbard
What will happen?
the flr will get wetthe water will pur ut
the air is strng t hld the water in the jar
Learning aims
1. The new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cnclude 2.T understand the thery f the experiment. 3.T learn actively.
experimentjarupsidepurcrrectscientific
n. 实验；试验n. 广口瓶；罐子n. 上部；上边v. 倒出；倾倒adj. 正确的；恰当的adj. 科学的
methdraincatfrcepressurecnclude
n. 方法；办法n. 雨衣n. 力量 v. 迫使；强迫n. 压力；压强；挤压v. 得出结论；推断出
Listen t the lessn and answer the fllwing questins.
1.What’s Danny’s thery? 2.What’s Jenny’s thery?3.What des Danny cnclude?
Danny thinks the flr will get wet.
Jenny thinks the water will stay in the jar.
Danny cncludes that air is strnger than he thught.
Read the lessn and answer the questins:1. Where des Danny think they shuld d the experiment? 2. What keeps the water in the jar? 3. Is Jenny sure f her thery? Hw d yu knw? 4. Why des Danny put n his raincat? 5. What des Danny cnclude?
The frce f the air.
He is afraid t get wet.
The air is strnger than he thught.
Yes, she is. She asks Brian t d the experiment ver Danny’s head and she knws he wn’t get wet.
Read and put the sentences in the crrect rder.
( )Put a piece f cardbard ver the jar.( )The jar f water is upside dwn , but the water stays in the jar .This is because air pressure pushes the cardbard nt the jar .( )Fill the glass jar with water.
( ) Turn the glass jar ver quickly .Hld yur hand n the card fr a few secnds.( ) Remve yur hand frm underneath the jar . What happens ?( ) There is mre air utside the jar than inside , s there is mre air pressure utside than inside .
Danny, Jenny and Brian are in the lab.Brian: Let’s d an experiment. I fill a jar with water. I cver the tp with a piece f cardbard and hld it there.Then I turn the jar upside dwn and take my hand ff the cardbard.Can yu guess what will happen?Danny: I think the flr will get wet.We shuld d this experiment utside, Brian.Jenny: I think the cardbard will hld the water.Danny: I dn’t think s.
fill …with… 用…装满… He has filled his case with many bks. cver…with… 用…盖住…I cver the tp with a piece f cardbard.
upside dwn “向下翻转过来”. Yu hld the bk upside dwn. 你把书拿倒了。right side up “正面朝上”
Jenny: Yu think the water will pur ut,Danny. I think the water will stay in the jar. Let’s test which thery is crrect.Brian: Gd idea, Jenny. That’s called the scientific methd.Jenny: I am s sure f my thery that Brian can d the experiment ver yur head and I knw yu wn’t get wet.
be sure 表示肯定, 有把握,而be nt sure 表示不确定be sure/ be nt sure 后可接句子，还可接代词、名词、动名词或不定式。常见用法： be sure f sb / ding sth , be sure t d sth be sure that…
Danny: Well, let’s try it!Brian: Are yu ready, Danny?Danny: N! Wait!(He puts n a raincat and sits dwn.) Nw I think I’m ready.Jenny: Brian, take yur hand ff the cardbard.Danny: N！(Danny clses his eyes tightly, and Brian takes his hand ff the cardbard.The water stays in the jar)Jenny: See, Danny!Danny: Hw is that pssible?
意为“把从拿开”Please take yur hand ff the fd.take ff “摘掉，脱掉；起飞”When will the plane take ff?
Brian: The frce f the air keeps the water in the jar. It is strng enugh t hld the water.Danny: Ww!Brian: S what have we discvered?Jenny: We have discvered that the air pressure helps the cardbard hld the water in the jar.Brian: Right. What d yu cnclude,Danny？Danny: I cnclude that air is strnger than I thught..
enugh 的两种用法1.enugh 与修饰词的排队顺序:(1)作形容词时, 置于名词前、后均可 (2)作副词时, 置于所修饰的形容词、副之后2. enugh t d sth. 常与t. . . t或s. . . that进行句型转换Tm isn’t ld enugh t g t schl. →Tm is t yung t g t schl. →Tm is s yung that he can’t g t schl.
Try t d the experiment in this lessn yurself.
Task tips: What happens when yu use less water, mre water, wet cardbard, r different kinds and sizes f jars?
1. He lcked the dr ________ (careful) befre he left.2. Let's ______ (finish) the wrk tgether nw.3. Can yu guess what __________ (happen) in 100 years?4. What's anther way f _______ (say) “autumn”?
I. 用所给单词的适当形式填空。
will happen
1. 我确信你是一个诚实的人。I ______ ______ that yu are an hnest man.2. 请用一块玻璃盖上那个杯子。Please ______ the cup _____ a piece f glass.3. 小心，否则你会弄湿的。Be careful, r yu'll ______ ______.4. 把箱子倒过来，你会找到标签的。______ the bx _______ _______, then yu'll find the label.
II. 根据所给汉语意思翻译下列句子。
am sure
cver with
get wet
Turn upside dwn
1. Preview the wrds and expressins in Lessn 26.2. Finish the exercise f this lessn.
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