Lesson25Let’sDoanExperiment!

1、Unit 5Look into Science,Lesson 25 Lets Do an Experiment!,学习目标: 1.会读会写本课的10个单词和8个短语 2.能流利的读课文并理解课文大意完成相应习题. 3.会运用下列的表达: 1)Then I turn the jar upside down and take my hand off the cardboard. 2）The force of the air keeps the water in the jar. 3)It is strong enough to hold the water. 4)We have discovere

2、d hat the air pressure helps the cardboard holh the water in the jar. 4.能完成本课的实验并用英语表达实验步骤.,实验,试验 广口瓶 上部 倒出 正确的，恰当的 科学的 方法，办法 雨衣 力量，迫使，强迫 压力，压强 得出结论，推断出,把翻转过来 涌出 科学方法 把从拿开 做一个实验 一张硬纸板 用装满,listen to the tape,and then read the text.and finish Ex2. Read the text again and finish Ex1. Talk about”How to

3、do the experiment.,Listening and Reading :,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 cardbo

4、ard 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.,2,5,1,3,4,6,Where does Danny think they should do the experiment?

5、 What keeps the water in the jar? Is Jenny sure of her theory?How do you know? Why does Danny put on his raincoat? What does Danny conclude?,Read the lesson and answer the questions.,Danny thinks that they should do the experiment outside.,The force of the air./The air pressure.,Yes,she is.She is so

6、 sure of her theory that Brian can do the experiment over Dannys head and he wont get wet.,Because he thinks he will get wet.,Air is stronger than he thought.,How to do the experiment ?,1.Fill the glass jar with water. 2.Put a piece of cardboard over the jar. 3.Turn the glass jar over quickly,Hold y

7、our hand on the cardboard for a few seconds. 4.Take your hand off the cardboard.What happens? 5.The jar of the water is upside down ,but the water stays in the jar. 6.There is more air outside the jar than inside,so there is more air pressure outside than inside,1.Then I turn the jar upside down and

8、 take my hand off the cardboard. turnupside down意为“把翻转/倒过来”,相当于turn over。upside down意为“正面朝下”。 takeoff在本句中意为“使离开/脱离”或“把从拿开”。 【拓展】take off意为“摘掉,(飞机)起飞,脱掉”。 2.Thats called the scientific method. be called意为“被叫作”,是被动语态。被动语态是由“be+及物动词的过去分词”构成,其中be动词可随句子时态的变化而变化。 scientific为形容词,意为“科学的”。scientist为可数名词,意为“科

9、学家”,science为不可数名词,意为“自然科学”。 3.It is strong enough to hold the water. “It is+形容词+enough to do sth.”意为“做某事是足够的”,常用来表述某人或某物的能力或特征。该句型可以和tooto及sothat句型相互转换。 4.force sb. to do sth.=force o doing强迫某人做某事 The robber forced him to hand over the money.强盗强迫他交出钱. His father forces him to do lots of housew

10、ork. =His father forces him into doing lots of housework.,What is science? What is science? Can you explain? Please make it easy for my brain. Its about making observations. Why do onions make me cry? Why do clouds go by? What keeps the birds in the sky? Thats just science. Its about matterthe universe. Why does a car stay on the road? Why is there green all over a