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4.正面朝下 ______________
5.把……翻转_______________________________
6.get wet __________ 7.do an experiment __________
8.a piece of cardboard ______________
9.take ...off...__________10.pour out_______________
11.科学方法____________12.force sb to do sth_________
13.the force of the air_________14.in the lab___________
15.be sure of sth/doing sth_________________
16.the air pressure_______________
17.keep the water in the jar____________________
1. Where does Danny say they should do this experiment outside?
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?
Read the dialogue with the following
questions.
Work in groups and think of this experiment.
Discuss it and write down how we do it.
What do we need?
a jar , some water , a piece of cardboard
What will do do?
1. Fill the jar with water.
2. Cover the top with a piece of cardboard.
3.Turn the jar upside down.
4. Take your hand off the cardboard.
What will happen?
1. The water will pour out , the floor will get wet.
2.?The water will stay in the jar , the force of the air will keep the water in the jar.
How do we do the experiment?