Unit 5 Lesson 25 Let's Do an Experiment! 课件(共23张PPT，内嵌音视频) 2023-2024学年冀教版英语九年级全一册

(共23张PPT)
Unit 5
Lesson 25
Let's Do an Experiment!
新课导入
In which subject do you often do experiments
Have you ever done any experiments
Do you like to do experiments
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
预习检测
1.We did ____ experiment in physics class.
A. a B. an C. any D. /
2.Please fill the bottle ____ water.
A. with B. of C. in D. for
B
A
3.Li Lei is ______ to carry this box.
A. too strong B. enough strong C. strong too D. strong enough
4.Are you sure ______ the coming football match
A. to B. with C. of D. for
5.The ______ of the air keeps the water in the jar.
A. force B. forces C. pressures D. water
D
C
A
知识梳理
1.Then I turn the jar upside down and take my hand off the cardboard.
◆turn…upside down意为“把……翻转/倒过来”, 相当于turn over。upside down意为“正面朝下”。right side up意为“正面朝上”。
◆take…off…在本句中意为“使……离开/脱离……”或“把……从……拿开”。
【拓展】take off意为“摘掉,(飞机)起飞,脱掉”。
get wet
意为：变湿
get在本句中是系动词，意为“变得”后接形容词作表语
2. I think the floor will get wet.
拓展：get along with与…….相处
get away离开，逃脱
get back 取回，回来，报复
get off下车，动身
3. be sure of 意为“确信；对……有把握”。
4. put on 意为“穿上”。 “动词+副词”构成的短语。
e.g. I am sure of the fact. 我确信这个事实。
5. pour out：“倒出，使流出，涌出”。　
pour…into…：“把……倒进……”。
6. It is+形容词+enough to do sth.”“做某事是足够……的”。
=too…to…=so…that…
e.g. : He is too old to go to school.
7. conclude from意为“从……推断，从……中得出”。
e.g. : What do you conclude from them
你能从中得到什么结论？
介绍自己做实验的过程
What kinds of experiments have you done in science class
Biological experiment
Physical experiment
Chemical experiment
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.
jar
a piece of cardboard
water
→
→
→
Read the dialogue and find out what we need to do the experiment.
(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!
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.
Let's Do It!
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.
Try to do the experiment after watching this video.
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.
活动小结
通过纸杯、水、纸板的小实验，我们得知：倒置的水杯中的水因为________向上的压力而没有流下来。
空气
当堂检测
一、根据首字母或汉语提示写单词
1.Let’s do an 　 　 (实验).
2.She gave me a c answer.
3.I’m sure that the f of the air will keep the water in the jar.
4.Students say they have a lot of 　 　 (压力).
5.That’s called the scientific 　 　 (方法).
experiment
pressure
orrect
orce
method
二、根据汉语提示完成句子
1.我用硬纸板盖住广口瓶的顶部。
I 　 　 the top of the jar 　 　 a piece of cardboard.
2.物理课上我们经常做实验。
We often 　 　 　 　 in physics classes.
3.请不要把手从椅子上拿开。
　 　 　 　 your hand 　 　 the chair.
4.丹尼认为水将会流出来。
Danny thinks the water will 　 　 　 　.
5.我断定空气的力量比我想的更加强大。
I 　 　 that air is 　 　 than I thought.
cover
with
do
experiments
Don’t
take
off
pour
out
conclude
stronger
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