冀教版九年级上册Unit 5 Look into ScienceLesson 25 Let’s Do an Experiment!教学ppt课件

设计说明

首先,通过跟唱歌曲What Is Science?导入新课。接着，利用图片，通过讨论图片来学习本课节的词汇，并跟读练习。然后，通过听录音回答问题进入本课对话的学习；通过速读回答问题、细读回答问题、阅读找短语并翻译、读后表述如何做实验等一系列活动学习本课内容。最后，处理剩余的练习题，并利用Let’s Do It! No.3要求学生再次做实验，并写出实验过程和经过，提升学生的写作能力。本课节先通过词汇的教学为后面的学习扫清障碍，再由浅及深地展开对话的学习。最后，通过提建议来提升学生综合语言运用能力。

教学目标

通过本课节的教学，学生达成以下目标：

1. 知识目标

掌握单词：correct, method, force

接触单词：experiment, jar, upside, pour, scientific, raincoat, pressure, conclude

短语：turn...upside down, pour out, scientific method, take...off

2. 能力目标

(1)掌握本课所学的单词和英语表达；

(2)能用英语描述实验的过程。

3. 情感目标

养成用科学的思维方式来分析生活中的现象。

重点难点

1. 重点：掌握本课所学的单词和英语表达。

2. 难点：能用英语描述实验的过程。

教学准备

PPT课件；本课节用到的音频。

授课时数

1课时

教学过程

Step 1  Warming up

Sing a song.

Ask: Do you like science? (Yes./No.) What is science？Now, let’s sing a song What Is Science? along with the music.

What Is Science?

Step 2  Presentation  

1. Teach the new words experiment, correct, conclude and expressions scientific method with the pictures by talking about them.

Teacher says: Look! What’s the man doing? (He is doing an experiment.) By doing the experiment, we can test if the things are correct or wrong. So it is the scientific method. And with the scientific method, we can conclude the right result.

2. Teach the new words jar, pour and expressions turn... upside down, pour out with the pictures by talking about them.

  Teacher asks: Look! What’s this? It’s a jar. And it’s right side up. There’s some water in it. Now, let’s turn it upside down. The water pours out.

Right side up正面朝上   turn... upside down把……翻转；倒过来

3. Teach the new words raincoat with the picture and another  

two new words force, pressure.

   raincoat /ˈreɪnkəʊt/ n.雨衣

force /fɔːs/ n.力量  v. 迫使；强迫

pressure /ˈpreʃə/ n. 压力，压强；挤压

4. Get the class to read the new words following the recording, and read the expressions alone.Then remember them.

   experiment  n. 实验；试验

jar  n. 广口瓶；罐子

upside  n. 上部；上边

pour  v. 倒出；倾倒

correct  adj. 正确的；恰当的

scientific  adj. 科学的

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

Step 3  Listening and answering

Get the class to listen to the dialogue and answer the question.

 What are Danny, Jenny and Brian doing in the lab?

 Answer: They’re doing an experiment.

Step 4  Reading

1. Fast-reading

Get the class to read the passage fast and answer the questions.

 (1) What’s Danny’s theory?

 (2) What’s Jenny’s theory?

Answers:

(1) Danny thinks the water will pour out, the floor will get wet.

(2)Jenny thinks the water will stay in the jar, the cardboard will hold the water.

2. Careful-reading

 Get the class to read the lesson and answer the questions. (Let’s Do It! No. 1)

 (1) Where does Danny think they should do the experiment?    

(2) What keeps the water in the jar?

(3) Is Jenny sure of her theory? How do you know?

(4) Why does Danny put on his raincoat?    

(5) What does Danny conclude?

Answers:

(1) He thinks that they should do the experiment outside.

(2) The force of the air. /The air pressure.

(3) Yes, she is. She is so sure of her theory that Brian can do the experiment over Danny’s head and he won’t get wet.

(4) Because he thinks he will get wet.

(5) Air is stronger than he thought.

3. Get the class to read the dialogue and find the following expressions. Then translate them into Chinese.

do an experiment做实验

fill...with...把……装满……

cover...with...用……盖住……

turn…upside down把……翻转；倒过来

   take...off把……拿开

get wet变湿

pour out涌出

  scientific method科学方法

be sure of确信

so...that... 如此……以至于……

put on穿上

adj./adv.+ enough to do sth. 足够……可以做某事

Step 5  Reading and saying

  Get the class to read the dialogue and say out how to do the experiment according to the pictures.

Step 6  Exercises

1. Read the experiment. Put the sentences in the correct order. (Let’s Do It! No. 2)

□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.

 Answers: (2  5  1  3  4  6)

2. Let’s have a try. (Let’s Do It! No. 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?

Step 7　Summary

 Sum up what we’ve learnt in this period with the class.

  1. 本课所学的词汇

   turn...upside down 把……翻转；倒过来

   pour out涌出

   scientific method科学方法

   take...off把……拿开

2. 如何做实验

Step 8  Language points

1. Let’s do an experiment.咱们做个实验吧。

  experiment

  ① n. 实验；试验

  do experiments/do an experiment 做实验

  We often do experiments in the lab. 我们经常在实验室里做实验。

  ② v. 做实验；进行实验

  常与介词on，with连用，来表示“试验……，试用……”。

  Let’s experiment with the machine.咱们试一下这台机器吧。

2. Then I turn the jar upside down and take my hand off the cardboard.

然后，我将广口瓶倒置并将我的手从纸板上拿开。

 (1) turn...upside down 把……翻转；倒过来(=turn over)

   upside down正面朝下      right side up 正面朝上

   He turned the bottle upside down and poured the water inside.

   他把瓶子倒过来，倒出里面的水。

   You hold the book upside down.            

   你把书拿倒了。

(2) take…off… 把……从……拿开

  Please take the pen off the newspaper.请把钢笔从报纸上拿走。

  Don’t take your hand off the jar.不要把手从广口瓶上拿走。

 【拓展】take off 摘下(眼镜、戒指等)；脱下(衣、帽、鞋等)；

  (飞机等)起飞

  He took off his glasses and cleaned them. 他摘下眼镜，把它擦干净。

  Don’t take off your coat. It’s cold outside. 别脱下你的外套，外面冷。

  The plane will take off in ten minutes.飞机将在10分钟后起飞。

3. You think the water will pour out, Danny. 你认为水会撒出来，丹尼。

  pour out 涌出；倒出；使流出

  其中，pour用作动词，意为“倒出；倾倒”。

  Look! The thick smoke is pouring out. 看！浓烟正在涌出。

  Let me pour out the tea for you. 让我为你倒茶吧。

 【拓展】pour …into…把……倒进……

  Pour the milk into the blender. 把牛奶倒进搅拌器。

4. Let’s test which theory is correct. 让我们检验一下哪一个理论是正确的。

  correct

   ① adj. 正确的；恰当的(=right)

   correct/right answer 正确的答案

   Your answer is not correct/right. 你的答案不对。

   ② v. 改正；纠正；矫正

   Correct your mistakes. 纠正你的错误。

 5. The force of the air keeps the water in the jar.

空气的力量使水保持在广口瓶里。

   force

   ① n. 力；力量

   the force of… ……的力量

   The force of the explosion blew out all the windows. 

   爆炸的冲击力把所有窗户都震碎了。

   ② v. 迫使；强迫     

   force sb. to do sth. 迫使某人做某事

   It’s impolite to force others to do something unpleasant.

   迫使他人做令人不高兴的事情是不礼貌的。

Step 9  Homework

1. Remember the new words and expressions learnt in this lesson.

2. Write a passage about how to do an experiment.

3. Preview Lesson 26.

当堂达标

Ⅰ.根据句意及提示写出单词

1. It is the best ________ (方法) of working out the math problem.

2. Let’s go to the lab and do the e _____________ to see what happens.

3. Turn the jar u _________down and we can see what will happen.

4. The meaning of c__________ is the same as right.

5. We should believe in the ____________(science) research.

6. The __________(press) of water turns the wheel.

Ⅱ. 连词成句

1. with, jar, I, fill, a, water, some

  ________________________________________ .

2. guess, will, you, happen, can, what

  ________________________________________?

3. out, the, is, water, pouring

  _______________________________________ .

4. cardboard, he, off, hand, takes, his, the

  ________________________________________ .

5. conclude, what, you, theory, can

  ________________________________________ ?

答案: Ⅰ. 1. method  2. experiment  3. upside   4. correct  5. scientific

6. pressure

Ⅱ.1. I fill a jar with some water

2. Can you guess what will happen

3. The water is pouring out

4. He takes his hand off the cardboard

5. What theory can you conclude

板书设计

教学反思