Unit 5 Lesson 25 Let's Do an Experiment! 课件(共16张PPT)

(共16张PPT)
Unit 5
Lesson 25
Let's Do an Experiment!
新
课
导
入
Do you like to do experiments
What experiments have you ever done
Language Goal
新知学习
课堂小结
当堂检测
学习目标
重点研讨
1.掌握本课新单词: science, experiment, fill, prove, scientific, method.
掌握本课短语: do an experiment, fill…with, cover…with, turn…upside down, be (not) sure…
2.增强对科学实验的兴趣
新知学习
课堂小结
当堂检测
学习目标
重点研讨
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.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
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!
新知学习
课堂小结
当堂检测
学习目标
重点研讨
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.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
(1)Where does Danny think they should do the experiment
He thinks they should do the experiment outside.
(2)What keeps the water in the jar
The force of the air.
(3)Is Jenny sure of her theory How do you know
Yes,she is. Because she is so sure of her theory that Brain can do it.
(4)Why does Danny put on his raincoat
In order not to get wet.
(5)What does Danny conclude
He concluded that air is stronger than he thought.
1 Read the dialogue with the following questions.
Let's Do It!
新知学习
课堂小结
当堂检测
学习目标
重点研讨
2 Read the experiment.Put the sentence in the correct order on page 67.
2
5
1
3
4
6
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.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
Task tips:
What happens when you use less water, more water, wet cardboard, or different kinds and sizes of jars
Let's Do It!
3 Try to do the experiment in this lesson yourself.
新知学习
课堂小结
当堂检测
学习目标
重点研讨
4 Listen and sing along.
What Is Science
What is science
Can you explain
Please make it easy for my brain.
It’s about making observations.
Why do onions make me cry It’s about matter—the universe.
Why do clouds go by Why does a car stay on the road
What keeps the birds in the sky Why is there green all over a toad
That’s just science. Why can’t carry a heavy load
That’s just science.
重点研讨
课堂小结
当堂检测
学习目标
新知学习
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。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
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。
重点研讨
课堂小结
当堂检测
学习目标
新知学习
3.I’m sure the floor won’t get wet.
我确信地板不会湿。
be sure +that 从句表示“认为…一定…”
而be not sure 表示不确定.
e.g. I’m sure she will come here.
我确信她会来。
I’m not sure when he’ll come here.
我不能肯定什么时候来这儿。
be sure of 意为“确信；对……有把握”。
e.g.To be sure of the fact. 确信你说的是事实。
课堂小结
重点研讨
当堂检测
学习目标
新知学习
Unit 5
Lesson 25
掌握本课新单词: science, experiment, fill, prove, scientific, method.
掌握本课短语: do an experiment, fill…with, cover…with, turn…upside down, be (not) sure…
增强对科学实验的兴趣
当堂检测
重点研讨
课堂小结
学习目标
新知学习
一、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 wrong, and we can do an experiment to p_____ it.
5. Don't turn the bottle u______ down. It's too dangerous.
pside
method
theory
science
rove
当堂检测
重点研讨
课堂小结
学习目标
新知学习
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 you'll ______ ______.
4.把箱子倒过来，你会找到标签的。
______ the box _______ _______, then you'll find the label.
二、根据所给汉语意思翻译下列句子。
am sure
cover with
get wet
Turn upside down