Unit 5 Look into Science Lesson 25 Let’s Do an Experiment ! 课件21张

(共21张PPT)
Unit 5 Look into Science
Lesson 25
Ⅰ.Leading-in
What are they doing?
In which subject do you often do experiments?
Have you ever done any experiments?
Do you like to do experiments?
[k?'rekt]
[k?n'klu??(?)n]
[sa??n't?f?k]
['meθ?d]
[?k'sper?m?nt]
In Physics or Chemistry classes, we can get correct conclusions by
using scientific methods. Doing
experiment is a scientific method.
experiment
jar
upside
pour
correct
scientific
method
raincoat
force
pressure
conclude
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

II New words
[?k'sper?m?nt]
[d?ɑ:]
['?psaid]
[p?:]
[k?'rekt]
[sa??n't?f?k]
['meθ?d]
['reink?ut]
[f?:s]
['pre??]
[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
III. Introduction
Read the dialogue and find out what we need to do the experiment
jar
a piece of cardboard
water
→
→
→
Ⅳ.Procedure
Main Sentences
1. I fill a jar with water.
fill …with…用…装满……
He filled his basket with many apples.
2. I cover the top with a piece of cardboard and hold it there.
cover…with… 用……盖住……
Please cover your right eye with your hand.
upside down 的意思是“正面朝下”
You hold the book upside down.
That picture is upside down
right side up 是“正面朝上”的意思
.
3. Then I turn the jar upside down and take my hand off the cardboard.
take...off...意为“把......从......拿开”
Please take your hand off the food.
take off “摘掉，脱掉；起飞”
When will the plane take off?
It's cold outside, don't take off your coat!
1. Where does Danny think they should do the experiment?
2. What's Jenny's theory?
3. Why does Danny put on his raincoat?
1. Danny thinks that they should do the experiment outside.
2. The cardboard will hold the water.
/The water will stay in the jar.
3. Because he thinks he will get wet.
Read the lesson and answer the questions.
What will happen?
Look and guess.
The water will pour out.
The water will stay in the jar.
or
Let’s do the experiment!
The water stays in the jar.
Ⅴ.Conclusion
1.The force of the air keeps the water in the jar.
2. We discovered that the air pressure helps the cardboard hold the water in the jar.
3. We conclude that air is stronger than we thought.
What do you learn from this experiment?
ⅤI. Summary
&Extension
The Scientific Method Worksheet
Name: _______________________________________
Material: _______________________________________
Procedure(过程):
1. Fill a jar with water.
2. Cover the top with a piece of cardboard and hold it there.
3.Turn the jar upside down.
4.Take hand off the cardboard.
Results：
Conclusions:
_______________________________________
The force of the air / The air pressure
a jar, a piece of cardboard, some water
The water stays in the jar.
The force of the air keeps the water in the jar.
Experiment Report
Today we did an experiment about...
In this experiment, we used...
At first,
Second,
Then,
At last,
At the end, we found...
So, we concluded that...
What will happen when you use less water, more water, wet cardboard, or different kinds and sizes of jars.
ⅤII.Homework