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(共16张PPT)
Unit 5
Look into Science
Lesson 25
Let’s Do an Experiment!
science
scientist
instrument
lab
universe
doing
experiment
What words can you think of that is related to science
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.
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.
Lead in
The jar is filled with water.
upside n.上面；上部
The jar is upside down.
It is facing up.
If you hold a jar that is filled with water upside down, what will happen
Lead in
I guess the water will pour out.
I guess the water will ...
Listening tasks
If you hold a jar that is filled with water upside down, what will happen
New words
The _____ of the wind is very strong.
It can ______ the trees to bend down(弯腰).
force
force
force n. 力量 v. 迫使；强迫
the force of...... “......的力量”
force sb.to do sth.＝force sb.into doing sth.“强迫某人做...”
The war forced people to leave their home.
战争迫使人们离开了他他们的家园。
New words
1. My mother often helps me ________ my mistake.
2. Who can give us a _________ answer to this question.
correct
correct
force adj. 正确的; 恰当的
v. 纠正，改正
1.There are ______ answers to the question.
2.__________ is force that you produce when you press hard on something. .
3.What is your favourite cooking _______, boiling or frying
4. An __________ is a scientific test done in order to discover what happens to something in particular conditions.
5. What can be _________ from these observations.
correct
Pressure
method
experiment
concluded
New words
Read the lesson and answer the questions.
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.
Reading tasks
She is filling a jar with water.
She is covering the top with a piece of cardboard.
She is holding the jar over Danny’s head.
She is turning the jar upside down.
Presentation
What is the girl doing
Read 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 card 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 .
2
5
1
3
4
6
Reading tasks
strong enough, take...off, pour out, science, put on, be covered with
1.The cardboard will hold the water in the glass if I _____ my hand _________ it.
2.He is ________________ to lift that rock.
3.We listened to him ____________ his troubles.
4._________ your winter coat if you are going out.
5.We all support his __________ research.
6.In winter, the ground _________________ snow.
take off
strong enough
pour out
Put on
scientific
is covered with
Exercises
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
Let’s Do It
experiment jar upside pour correct scientific method raincoat force pressure conclude
turn…upside down pour out
scientific method take…off
I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet.
So what have we discovered
That’s called the scientific method.
The force of the air keeps the water in the jar.
Summary

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