英语九年级上册Lesson 25 Let’s Do an Experiment!课文配套课件ppt

这是一份英语九年级上册Lesson 25 Let’s Do an Experiment!课文配套课件ppt，共22页。PPT课件主要包含了objectives，Discuss ，xperiment，heory，rove，pside，bserve，put，fill，with等内容，欢迎下载使用。
The new wrds: experiment, jar, upside, pur, crrect, scientific, methd, raincat, frce, pressure, cncludeT understand the thery f the experiment.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
D yu like t d experiments?What experiments have yu dne?
Listen and answer the fllwing questins.
1.What’s Danny’s thery? 2.What’s Jenny’s thery?
Danny thinks the flr will get wet.
Jenny thinks the water will stay in the jar.
Pre-reading
While-reading
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?
He thinks they shuld d it utside.
The frce f the air.
Yes, she is. She thinks that Brian can d the experiment ver Danny’s head.
4. Why des Danny put n his raincat? 5. What des Danny cnclude?
He thinks the water will pur ut.
The air is strnger than he thught.
I fill a jar with water. 我用水把瓶子装满。 fill …with…用…装满…… He has filled his case with many bks. 他已经把书装满了箱子。 cver…with… 用……盖住……
2. I turn the jar upside dwn. 我把广口瓶倒置。
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”
be sure +that 从句表示“认为…一定…” 而be nt sure 表示不确定.
eg. I’m sure she will cme here. 我确信她会来。 I’m nt sure when he’ll cme here. 我不能肯定什么时候来这儿。
I’m sure the flr wn’t get wet. 我确信地板不会湿。
4. We’ll d the experiment and bserved what will happen. 我们将做这个实验并观察会发生什么情况。 bserved 动词, “观察”。 bserve sb. d/ ding sth. eg. I bserved her dance. When I passed by the grass, I bserved him walking.
Fill in the blank with the prper wrd. The first letter is given.
1. Let’s d the e and see what happens.2. A “t ” is an idea and predicts what will happen.3. We can p wh’s right.4. Turn the jar u dwn and we can see what will happen.5. “O ” is anther way f saying “watch carefully”.
Let’s d an interesting experiment. First, I ____ a jar _____a desk, ____it _____ water, then _____the tp ____ a piece f cardbard. When I ____the jar ______ _______, can yu guess what will happen?
Hw d we d the experiment?
Pst-reading
Let’s D It !
In a small grup, try the experiment abve. Try it with the jar full. Try it again with the jar nearly empty. Write dwn yur bservatins. Did the experiment wrk? Did anyne get wet?
A balln is full f air. If we pierce(刺破) it with a needle, it will break with a lud bang. But if we put a piece f glue n the balln and d the same experiment, what will happen? Surprisingly, we wn’t hear the same sund. The balln will becme smaller and smaller. We will feel that the air is running ut slwly thrugh the pinhle(针孔). We knw the balln is made f
An Experiment abut a Balln
rubber(橡胶). When the balln is pierced, the airleaving the balln frms a kind f frce. Rubber iss thin that it can’t supprt(支撑) such frce. Sthe balln breaks quickly with a lud bang. Butthe glue is different. It’s strng enugh t supprt the frce f the air. Peple have learned smething frm this experiment. They have used this methd t make tires(轮胎).
I. 根据汉语或首字母提示，完成下列句子。
1. It is the best ________ (方法) f wrking ut the math prblem.2. Have yu heard f the ________ (理论）befre?3. My daughter likes _________ (科学) mre than English.4. Yur answer is wrng, and we can d an experiment t p_____ it.5. Dn’t turn the bttle u______ dwn. It’s t dangerus.
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”?
II. 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.
III. 根据所给汉语意思翻译下列句子。
am sure
cver with
get wet
Turn upside dwn
D the experiment by yurself.
Finish the exercise f this lessn.