Unit5 Lesson25 Let's Do an Experiment! 教学设计

UNIT 5 Look into Science
Lesson 25: Let’s Do an Experiment!
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 / re nk t/ n.雨衣
force /f s/ n.力量 v. 迫使；强迫
pressure / pre / 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
turn...upside down 把……翻转；倒过来 pour out 涌出 scientific method 科学方法 take...off 把……拿开
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 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
UNIT 5 Look into Science Lesson 25: Let’s Do an Experiment!
correct, method, force, experiment, jar, upside, pour, scientific, raincoat, pressure, conclude 1. 短语： 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