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课件网) Lesson 25 Let’s Do an Experiment! Leading in What experiments have you done Maybe we have done…… Leading in Do experiments in science class. Leading in Let’s do an experiment. a piece of cardboard a jar some water We need Leading in fill the jar with water cover the top with a piece of cardboard turn the jar upside down Take hand off the cardboard Leading in What will happen the floor will get wet the water will pour out Leading in We conclude the air is strong to hold the water in the jar Leading in Learning aims 1. The new words: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude 2.To understand the theory of the experiment. 3.To learn actively. Words and Expressions experiment jar upside pour correct scientific 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 Words and Expressions method raincoat force pressure conclude 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 Listen to the lesson and answer the following questions. 1.What’s Danny’s theory 2.What’s Jenny’s theory 3.What does Danny conclude Danny thinks the floor will get wet. Jenny thinks the water will stay in the jar. Danny concludes that air is stronger than he thought. 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 the air. He is afraid to get wet. The air is stronger than he thought. 1 Yes, she is. She asks Brian to do the experiment over Danny’s head and she knows he won’t get wet. 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. 2 5 1 2 ( ) 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 . Read and put the sentences in the correct order. 3 4 6 2 原文呈现 Danny, Jenny and Brian are in the lab. Brian: Let’s do an experiment. I fill a jar with water. I cover the top with a piece of cardboard and hold it there.Then I turn the jar upside down and take my hand off the cardboard.Can you guess what will happen Danny: I think the floor will get wet.We should do this experiment outside, Brian. Jenny: I think the cardboard will hold the water. Danny: I don’t think so. fill …with… 用…装满… He has filled his case with many books. cover…with… 用…盖住…I cover the top with a piece of cardboard. upside down “向下翻转过来”. You hold the book upside down. 你把书拿倒了。 right si ... ...
