Unit 5 Look into Science Lesson 25 Let’s Do an Experiment!课件（17张PPT）

课件17张PPT。lesson25
Let`s do an experiment冀教版九年级上册a piece of cardboard
a jar some waterWe needLet`s do an experimentfill the jar with water
cover the top with a piece of cardboard
turn the jar upside down
Take hand off the cardboardWhat will happen?the floor will get wet
the water will pour outWe concludethe air is strong to hold the water in the jarlisten and answerwhat will they do?
what is Danny`s theory?
what is Janny`s theory?
what do we conclude?
Read and doread quickly and fill in the blank with T or F.
1. A theory is an experiment. ( )
2. They will do the experiment over Danny`s head.( )
3. The air pressure helps the cardboard hold the water in the jar.( )FTTRead and doread quickly and answer the qestions.
1. Where does Danny think they should do the experiment?
2. What helps hold 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?
Read and put the sentences in the correct order( ) Put a piece of cardboard over the jar.
( ) The jar of the 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 second.
( ) 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----6Language points1. I fill the jar with water.
fill---with---用---装满------ （主语是人）
Eg: I have filled the bottle with milk.
同义句：be filled with 或 be full of (主语是物或容器)
The bottle was filled with milk.
The bottle was full of milk.
Language pointsI cover the top with a piece of cardboard and hold it here.
cover---with---用---覆盖------ （主语是人）
Eg: I covered the snow with grass.
同义句：be covered with (主语是物或容器)
The snow was covered with grass。
The classroom _______________students.
He_____________the box _______books.
It snows heavily, the earth ______________snow.is filled with/is full offillwithis covered withLanguage pointsI`m so sure of my theory that ---
be sure of ---
be sure to do ---
be sure that --- （that从句）
Eg: He is sure______the experiment.
He is sure______do the experiment.
He is sure______he can do the experiment.
oftothatPractice and discuss in groupslet`s do the experiment in groups:
One students gives instructions in English.
Another one follows the instructions to do the experiment
The others observe what will happen.
The group talk about and write down the steps
words and expresses1. do an experiment_____2.turn…upside down_______
3. get wet__________ 4. a piece of cardboard_______
5. scientific method______ 6. be(not)sure of…_________
7. the force of the air________8. cover…with __________
9. air pressure____________ 10.pour out________
做实验翻转变湿确信科学方法一张卡纸用---覆盖倾倒空气的压力空气的压力从下面方框中选择适当的短语并用其正确形式填空。每个短语用一次be sure of scientific method turn over take off fill … with…
1 . She_________ the tape, and look at the other. side of it
2. Please___________ your coat and hang it on the wall.?
3. Can you help me _______the bottle _______the apple juice?
4. You should use _______________to lose weight.
5. She_________ passing the exam, because she has prepared for it for more than a month.turn overtake off fill withscientific method is sure of 完成句子。
1. 我们把瓶子装满了牛奶。 We ______ the bottle _____ milk.
2. 我用一张纸把食物盖上了。I ________ the food _____a piece of paper.
3. 我认为桌子会湿。I think the desk _____ _____ ____ quickly.
4. 我确信汤姆不会来了。I ____ ____ Tom won’t come.
5. 我们要做这个实验，来观察一下会发生什么事情。
We will ____ the experiment and _________ what will happen.
6. Please ______ jar__________ __________(把瓶子倒置)
7. Don’t worry. I _______ _________ that you’ll all right soon.(确信)
8. I need five ____ ______ ________.( 5张纸)fillwithcoveredwithwill get wetam sure do observe turn upside down am sure pieces of paper HomeworkWrite a passage to describe an experiment