冀教版英语九年级上Lesson 25 Let's Do an Experiment精品课件

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1、Lesson 25,Unit 5 Look into Science,5,Unit,Lesson 25 Lets Do an Experiment！,学习目标,objectives,The new words: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude To understand the theory of the experiment. To learn actively.,Words,experiment jar upside pour co

2、rrect scientific,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,Words,method raincoat forcepressure conclude,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,Lead in,Discuss,Do you like to do experiments? What experiments have you done?,Listen to the tape and answer the following qu

3、estions.,1.Whats Dannys theory?2.Whats Jennys theory?,Danny thinks the floor will get wet.,Jenny thinks the water will stay in the jar.,Pre-reading,While-reading,Read the lesson and answer the questions.,1.Where does Danny think they should do the experiment? 2.What keeps the water in the jar?3. Is

4、Jenny sure of her theory? How do you know?,He thinks they should do it outside.,The force of the air.,Yes, she is. She thinks that Brian can do the experiment over Dannys head.,4. Why does Danny put on his raincoat? 5. What does Danny conclude?,He thinks the water will pour out.,The air is stronger

5、than he thought.,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 books. 他已经把书装满了箱子。coverwith 用盖住,Language Points,2. I turn the jar upside down. 我把广口瓶倒置。,upside down “向下翻转过来”. You hold the book upside down. 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 not s

6、ure 表示不确定.,e.g. Im sure she will come here. 我确信她会来。Im not sure when hell come here. 我不能肯定什么时候来这儿。,Im sure the floor wont get wet. 我确信地板不会湿。,4. Well do the experiment and observed what will happen.我们将做这个实验并观察会发生什么情况。observed 动词, “观察”。observe sb. do/ doing sth. e.g. I observed her dance.When I passed

7、by the grass, I observed himwalking.,Fill in the blank with the proper word. The first letter is given.,1. Lets do the e and see whathappens. 2. A “t ” is an idea and predicts whatwill happen. 3. We can p whos right. 4. Turn the jar u down and we can seewhat will happen. 5. “O ” is another way of sa

8、ying“watch carefully”.,xperiment,heory,rove,pside,bserve,Lets do an interesting experiment. First, I _ a jar _a desk, _it _ water, then _the top _ a piece of cardboard. When I _the jar _ _, can you guess what will happen?,put,on,fill,with,cover,with,turn,upside,down,How do we do the experiment,Post-

9、reading,Lets Do It !,In a small group, try the experiment above. Try it with the jar full. Try it again with the jar nearly empty. Write down your observations. Did the experiment work? Did anyone get wet?,A balloon is full of air. If we pierce(刺破) it with a needle, it will break with a loud bang. B

10、ut if we put a piece of glue on the balloon and do the same experiment, what will happen?Surprisingly, we wont hear the same sound. The balloon will become smaller and smaller. We will feel that the air is running out slowly through the pinhole(针孔). We know the balloon is made of,An Experiment about

11、 a Balloon,rubber(橡胶). When the balloon is pierced, the air leaving the balloon forms a kind of force. Rubber is so thin that it cant support(支撑) such force. So the balloon breaks quickly with a loud bang. But the glue is different. Its strong enough to support the force of the air. People have lear

12、ned something from this experiment. They have used this method to make tires(轮胎).,An Experiment about a Balloon,I. 根据汉语或首字母提示，完成下列句子。,1. It is the best _ (方法) of working out the math problem. 2. Have you heard of the _ (理论）before? 3. My daughter likes _ (科学) more than English. 4. Your answer is wron

13、g, and we can do an experiment to p_ it. 5. Dont turn the bottle u_ down. Its too dangerous.,pside,method,theory,science,rove,Practice,1. He locked the door _ (careful) before he left. 2. Lets _ (finish) the work together now. 3. Can you guess what _ (happen) in 100 years? 4. Whats another way of _

14、(say) “autumn”?,saying,II. 用所给单词的适当形式填空。,carefully,finish,will happen,1. 我确信你是一个诚实的人。 I _ _ that you are an honest man. 2. 请用一块玻璃盖上那个杯子。 Please _ the cup _ a piece of glass. 3. 小心，否则你会弄湿的。 Be careful, or youll _ _. 4. 把箱子倒过来，你会找到标签的。 _ the box _ _, then youll find the label.,III. 根据所给汉语意思翻译下列句子。,am sure,cover with,get wet,Turn upside down,Homework,Homework,Do the experiment by yourself.,Finish the exercise of this lesson.,