Unit 5 lesson 25课件 2024-2025学年冀教版英语九年级全册

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 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? 3 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 concludes that air is stronger than he thought. 2. Read the experiment. Put the sentences in the correct order. Put a piece of cardboard over the jar. The jar of water is upside down, but the water stays in the jar. This is because air pressure pushes the cardboard onto the jar. Fill the glass jar with water. Turn the glass jar over quickly. Hold your hand on the cardboard for a few seconds. Remove your hand from underneath the jar. What happens? There is more air outside the jar than inside, so there is more air pressure outside than inside. 2 5 1 3 4 6 3. Try to do the experiment in this lesson yourself. Task tips：What happens when you use less water, more water, wet cardboard, or different kinds and sizes of jars? 4. Listen and sing along. What is science? Can you explain? Please make it easy for my brain. It's about making observations. Why do onions make me cry? Why do clouds go by? What keeps the birds in the sky? That's just science. What Is Science? It’s about matter—the universe. Why does a car stay on the road? Why is there green all over a toad? Why can’t I carry a heavy load? That’s just science. Language points 1. Let’s do an experiment. 让我们来做一个实验。 ◉ experiment意为“实验；试验”，其常用搭配为：do/make/carry out an experiment，意为“做实验”。 ※ The results of the experiment confirmed our predictions. 实验结果证实了我们的预测。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2. Then I turn the jar upside down and take my hand off the cardboard. 然后我把罐子倒过来，把手从纸板上拿开。 ◉ turn…upside down意为“把……翻转；倒过来”，其反义短 语为：turn...right side up 把……正面朝上。 ※ Another idea is that the earth will turn upside down. So the North Pole will become the South Pole. 另外一个观点认为，地球会上下颠倒，北极会变成南极。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 ◉ take…off…意为“把……从……拿开”，take off 意为“脱掉， 摘掉，(飞机)起飞”。 ※ To show our respect, we usually have to take our gloves off whoever we are to shake hands with. 为了表示我们的尊重，无论和谁握手，我们通常都要脱下手套。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 3. I think the floor will get wet. 我想地板会湿的。 ◉ get意为“收到；(使)达到；变得”，作系动词，表示“变 得”，后跟形容词作表语。 ※ I get bored easily. 我易生厌倦。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 4. That’s called the scientific method. 这就是所谓的科学方法。 ◉ That’s called…意为“那被叫做……”， 此句是一般现在时 的被动语态，That在这句话中充当主语，is called 构成被动 语态结构。 ※ That’s called encoding the memory. 这被称为给记忆编码。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 5. I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. 我对我的理论很有信心， 布莱恩可以在你头顶上做这个实验，我确信你不会被淋湿的。 ◉ be sure of意为“确信”。 ※ I hope you are sure of your facts. 我希望你能肯定你说的都是事实。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 sure的常见搭配 be sure to do sth. 一定会做某事 (一般指局外人的推测，主语可以是人，也可以是物) be sure＋ that从句 意为“确信” make sure ＋that从句 意为“查明，弄清” for sure 意为“无疑，肯定” 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 ◉ over意为“在……上面”。 ※ She climbed over the wall. 她翻过墙去。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 辨析above，over与on above 只是笼统地表示“高于……，在……上方”， 其反义词为below。 over 表示在某物体的正上方，与某物体垂直但不接触，其反义词为under。 on 表示在某物体的表面之上，与某物体表面接触。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 Practice 一、根据句意及首字母或汉语提示补全单词。 1. It’s the best m________ of working out the math problem. 2. I’m sure that the f________ of the air will keep the water in the jar. 3. Can you help me c________ the mistake that you find? 4. Put on the __________ （雨衣） for it’s raining heavily. 5. Don’t turn the cup ________ （上部） down. ethod　 orce orrect raincoat　 upside 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 二、单项选择。 1. Tom is covering the cup ________ a piece of paper. A. for B. on C. with D. in 2. I won’t force anybody ________ anything. A. do B. does C. to do D. doing 3. Mum wants to watch CCTV news. Let’s ________ the TV. A. turn down B. turn on C. turn off D. turn up √ √ √ 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 Sum up 1. Vocabulary: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude 2. Structures and expressions: turn... upside down, pour out, scientific method, take... off 3. Important sentences: （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. Homework 1. Remember the new words and expressions learnt in this lesson. 2. Prepare Lesson 26. $$