(共27张PPT)
Unit 5 Look into Science
Lesson 25 Let's Do an Experiment!
1. To understand the meaning and usage of the new words and expressions.
2. To understand the dialogue and describe the experiment.
3. To learn the scientific method and enjoy science.
Learning objectives
What is science
Free Talk
What is science about
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
Why do clouds go by
What keeps the birds in the sky
That’s just science.
Listen and sing along.
4
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.
Listen and sing along.
4
Listening
Danny, Jenny and Brian are in the lab.
They are doing an experiment.
Will they succeed
□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.
Listen to the tape and 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.
Read the experiment. Put the sentences in the correct order.
2
2
5
1
3
4
6
New words and expressions.
experiment [ k sper m nt]
jar [d ɑ (r)]
upside [ psa d]
pour [p (r)]
correct [k rekt]
scientific [ sa n t f k]
n. 实验; 试验
n. 广口瓶; 罐子
n. 上部; 上边
v. 倒出; 倾倒
adj. 正确的; 恰当的
adj. 科学的
New words and expressions.
method [ meθ d]
raincoat [ re nk t]
force [f s]
pressure [ pre (r)]
conclude [k n klu d]
n. 方法；办法
n. 雨衣
n. 力量
v. 迫使；强迫
n. 压力；压强；挤压
v. 得出结论；推断出
Read the lesson and answer the questions.
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
Outside.
The force of air.
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.
1.Then I turn the jar upside down and take my hand off the cardboard. 然后, 我把瓶子倒置, 手离开纸片。
upside down 意思是“颠倒着, 倒转着; 乱七八糟”。
Language Points
right side up “正面朝上”
take…off… 把……从……拿开
eg：Please take your hand off the food.请把你的手从食物上拿开。
take off 还有“脱掉; 摘掉; (飞机)起飞”的意思
eg：It's hot in the house, please take off your coat.房间里很热, 请脱掉你的外套。
The plane will take off at 2：00 p.m.飞机将在下午两点起飞。
2.You think the water will pour out, Danny.
丹尼, 你认为水会洒出来。
pour在本句中的意思是“涌流”; 它还有“倒; 下倾盆大雨;倾诉”的意思
eg：She poured the rice carefully into the pot. 她小心翼翼地把大米倒入罐子里。
The rain has been pouring all day. 倾盆大雨下了一整天了。
You can pour your troubles to a close friend. 你可以向亲密朋友倾诉烦心事。
3. That’s called the scientific method.
拿被叫做科学方法。
That’s called...... 那被叫做......
此句是一般现在时的被动语态, 其结构为：
be动词(am/is/are)＋动词的过去分词。
eg：More money is saved by using both sides of paper.
通过使用纸的两面, 更多的钱被节省下来了。
4.I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet.我十分确信我的理论以至于布莱恩可以在你的头的上方做这个实验, 并且我知道你不会被淋湿。
be sure of “确信”
eg: I am sure of what he said. 我确信他所说的。
be sure to do sth. “一定会做某事”
eg: His team is sure to win. 他的对一定会赢。
be sure＋ that从句 “确信......”
I am sure that he can succeed.我确信他能成功。
[拓展] 与 “sure”有关的结构
make sure ＋that从句 查明, 弄清 She looked around to make sure that she was alone.她往四下里看看, 是不是只有她一个人。
for sure 无疑, 肯定 He will be here for sure within an hour.他一小时之内肯定到这儿。
5. The force of the air keeps the water in the jar.
气压会使水留在广口瓶内。
The force of...... “......的力量”
eg：the force of nature 大自然的力量
[注意]force作动词时, 常用的句式为：
force sb.to do sth.＝force sb.into doing sth.“强迫某人做某事”
eg：The war forced people to leave their home.
战争迫使人们离开了他们的家园。
6. So what have we discovered 那么, 我们发现了什么？
so 在本句中用作副词, 表示惊讶的语气。
eg：So you don't like it. 这么说, 你不喜欢它。
So you have difficulty in learning math.
看来你学数学有困难。
discover v. “发现, 发觉”
eg：Who discovered Hawaii 谁发现了夏威夷？
discover 指 “发现, 找到”本已存在,但未被发现或认识的事物 Columbus discovered America in 1492.哥伦布于1492年发现了美洲。
invent 指 “发明, 创造”出世界上本来不存在的东西 Mr. Smith invented a new teaching method.史密斯先生发明了一种新的教学方法。
find 指“找到”丢失的东西,但有时也表示凭经验或偶然发现了一种东西。 I can't find my English book.
我找不到我的英语书了。
[辨析] 不同的“发现”
What's scientific method
Discussion
Report Results
(Was your theory correct )
Test the Theory with an Experiment
Analyze Results and Draw Conclusion
New Questions Appear
Do Background
Research
Construct a Theory
(Hypothesis)
Ask a Question
Do the experiment and describe the steps in English.
Action
Try to do the experiment in this lesson yourself.
3
Task tips: What happens when you use less water, more water, wet cardboard, or different kinds and sizes of jars
What did we learn
experiment
jar upside
pour correct
scientific method
raincoat force
pressure conclude
turn…upside down
pour out
scientific method
take…off
That’s called the scientific method.
I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet.
He puts on a raincoat and sits down.
So what have we discovered
That’s called the scientific method.
The force of the air keeps the water in the jar.
Summary
根据句意及首字母提示完成句子.
1．I won’t force anybody ______ (do) anything.
2．It’s the best m______ of working out the math problem.
3．The students are doing _________(实验) in the lab.
4．My daughter likes _________ (科学) more than English.
5．The boy is ______(call)Jimmy. He is lovely.
to do
ethod
experiment
science
called
1. He ________ my wet coat and made me sit by the fire.
A．went by B．ran out
C．took off D．turned up
2. It is sure ________ tomorrow morning.
A．rain B．to rain
C．raining D．to be rained
3. We did ____ experiment in physics class.
A．a B．an C．any D．/
单项选择
GOOD JOB
