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课件网) Lesson 25: Let’s Do an Experiment ! Unit 5 Look into Science 单词: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude 短语: turn... upside down, pour out, scientific method, take... off 句子: （1）If you hold a jar that is filled with water upside down, what will happen （2）I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. （3）It is strong enough to hold the water. Learning Goals 1 能用英语流利地讲述在实验课上做过的实验。 2 Free Talk What kinds of experiments have you done in science class If you hold a jar that is filled with water upside down，what will happen Presentation Danny, Jenny and Brian are in the lab. Brian：Let’s do an experiment. I fill a jar with water. I cover the top with a piece of cardboard and hold it there. Then I turn the jar upside down and take my hand off the cardboard. Can you guess what will happen Danny：I think the floor will get wet. We should do this experiment outside, Brian. Jenny：I think the cardboard will hold the water. Danny：I don’t think so. Jenny：You think the water will pour out, Danny. I think the water will stay in the jar. Let’s test which theory is correct. Brian：Good idea, Jenny. That’s called the scientific method. Jenny：I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. Danny：Well, let’s try it! Brian：Are you ready, Danny Danny：No! Wait! (He puts on a raincoat and sits down.) Now I think I’m ready. Jenny：Brian, take your hand off the cardboard. Danny：No! (Danny closes his eyes tightly, and Brian takes his hand off the cardboard. The water stays in the jar.) Jenny：See, Danny! Danny：How is that possible Brian：The force of the air keeps the water in the jar. It is strong enough to hold the water. Danny：Wow! Brian：So what have we discovered Jenny：We have discovered that the air pressure helps the cardboard hold the water in the jar. Brian：Right. What do you conclude, Danny Danny：I conclude that air is stronger than I thought. Vocabulary experiment n. 实验；试验 jar n. 广口瓶；罐子 upside n. 上部；上边 pour v. 倾出；倾倒 correct adj. 正确的；恰当的 scientific adj. 科学的 Vocabulary method n. 方法；办法 raincoat n. 雨衣 force n. 力量 v. 迫使；强迫 pressure n. 压力，压强；挤压 conclude v. 得出结论；断定 turn... upside down 把……翻转；倒过来 pour out 涌出 scientific method 科学方法 take... off 把……拿开 Structures and Expressions Let’s do it! 1. 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 Outside. The force of air. 3. Is Jenny sure of her theory？How do you know 4. Why does Danny put on his raincoat 5. What does Danny conclude Yes, she is. She asks Brian to do the experiment over Danny’s head and she knows he won’t get wet. He is afraid that he will get wet. He conclud ... ...
