Find air 找空氣【教學目標】1. 通過在不同地點裝空氣的活動，發現我們周圍有一種能將袋子撐得鼓鼓的東西。2. 通過做將袋子里的空氣放出來的活動，調動多種感官，感知空氣的存在。3. 通過憋氣活動，知道人類的生存離不開空氣。【教學重點】知道我們的周圍有空氣。【教學難點】運用多種方法、調動多種感覺器官，感知空氣的存在。【教學準備】教師材料：PPT、相關視頻。學生材料：塑料袋；安全圖釘、水槽、抹布；口哨塑料袋組合。【教學時間】1課時【教學過程設計】Step 1：游戲熱身與問題導入1. T:Ill teach you Science in English.Is it fun?2. S:Yes.3. T:OK,lets play a game before class starts!The games name is “I say,you say”.Are you ready?4. S:Ready go.5. 師生拍手打節奏開始游戲。6. T:I say “eyes”.7. S:I say “see”.8. T:I say “see”.9. S:I say “bubbles”.10. T:I say “face”.11. S:I say “feel”.12. T:I say “feel”.13. S:I say “air”.14. T:I say “ears”.15. S:I say “hear”.16. T:I say “hear”.17. S:I say “voice”.18. T：OK.You did a good job.Next,I have a question.Where is the air?19. S:Its in the playground/house/classroom.20. T:Great!There is air everywhere.Today,well learn how to find air.It means “找空氣”.Step 2: 新知學習A.把空氣裝進袋子里1. T: Look,I have a bag.Can you put the air into the bag,and full of it?2. S: Yes,we can.3. T: OK.We know there is air everywhere,so except there,we need go to playground and basketball court to put the air into the bag.Please see the tasks and announcements clearly.4. 學生看屏幕上的操作要求。5. T：Do you understand?6. S: Yes.7. T: OK.The group leader distributes the bag to your members.8. 學生分組操作。9. T: Did you put the air into the bag?10. S: Yes.11. T: Is it really air in your bag? How to prove? You can discuss in group.Lets start!12. 學生分組討論證明方法。13. T: How to prove? Who can try?14. S:擠壓袋子袋子變小了/把袋子對準臉，會感覺到有風/把袋子戳個小洞放水里，水里會有泡泡產生.15. T: Your ideas are very good!Next Ill summarize your ways.【設計意圖：用塑料袋兜空氣，意在引導學生發現在我們的周圍存在一種看不見、摸不著的東西，它可以將塑料袋撐得鼓鼓的。】B.用多種感官感受空氣的存在1.T:We can do like this.（ppt展示操作要求）In pairs,make a hole with nail in the bag,place the hole in the water and loosen it with the other hand.Do you understand?2.學生看操作要求3.T:In pairs,make a hole with nail in the bag,place the hole in the water and loosen it with the other hand.Do you understand?4.S:Yes.5.T:OK,Ill give you 2 minutes to do this.Lets start.6.學生分組操作，老師作指導。7.T:OK,times up.Did you see any bubbles?8.S:Yes.9.T:Why did bubbles form?10.S:因為袋子里有空氣，當把扎洞的袋子放在水里，空氣就會跑到水里，然后就會產生氣泡。11.T:Very good!Bubbles in water are .12.學生一起回答：air.13.T:Good.Just now we used our face to prove that the air was in the bag.教師邊說邊展示板書。14.T:Next,can you use our face to prove that? You can discuss in your group.15.學生討論。16.T:How to prove? Who can try?17.S:我們可以把袋子對準臉放空氣，這樣我們的臉能感受到風，這就是空氣。18.T:Great！Let me summarize your ways.Look at the screen.19.學生看屏幕。20.T:In pairs,loosen the mouth of the bag close to the face slowly.Do you understand?21.S:Yes.22.T:Do you want to try?23.S:Yes.24.T:OK,are you ready?25.S:Ready go.26.學生分組操作。27.T: We can feel with our face.How do you feel?28.S:感覺有風吹過我的臉頰/感覺臉涼涼的.29.T：OK!What brushed your face?30.S: Its air.31.T:Yes,the air passed by us and made us feel cool.This is wind.32.T:So we can use this way to prove that air is in your bag.（教師邊說邊板書）33.T:Next,look,I have a treasure.Listen carefully.34.教師播放錄音,學生認真聽。35.T:Guess,what is it?36.S:It is whistle.37.T:Yes,its whistle.Can you blow the whistle? Please say what do you think.38.S:可以直接用嘴吹。39.Y：OK,good!Expect this way,do you have another way?40.S:可以用袋子里的空氣使口哨響起來。41.Y：Wow,amazing.Come here and tell us how to do this.42.學生上前邊解說邊做示范。43.S:先把袋子裝滿空氣，然后把口哨放在袋口，一只手抓緊口哨，另外一只手擠壓袋子。44.T:Oh,you did it!Big hands for you.45.T:Boys and girls,do you want to try?46.S:Yes.47.T:OK,please see the announcements on the screen carefully.48.S:學生認真看操作要求。49.T:You must work together in your group and use only one bag and one whistle.Then put the whistle in the mouth of the bag.Clench the whistle and loosen the bag slowly in the other.Are you clear?50.S:Yes.51:T:OK,lets do it.52. 學生動手操作。53. T:OK,times up.Did you hear the voice?54. S:Yes.55. T:Who blew the whistle?56. S:Its air.57. T:Well done！So we can use our ears to hear the voice that the air made.（教師邊總結邊板書）We learned 3 methods to prove it is air that we found.Who can summarize them?58. 學生總結：第一種把袋子扎洞然后放到水里，我們會看到泡泡，說明剛剛我們裝的是空氣；第二種把袋子靠近臉放開，我們會感受到有風吹拂我們的臉頰，這就是空氣；第三種把口哨放進袋口，擠壓袋子能發出聲音，這是空氣的力量。59. T:You are very good！Boys and girls,you did g good job.Big hands for you.【設計意圖：用不同的方法把袋子里的空氣放出來，可以用皮膚感受倒、用耳朵聽到、用眼睛看到“空氣”。通過多種感官的參與，引導學生更加清晰和全面地感受到空氣的存在，并學習一些可以直觀感受到空氣存在的方法。】C.空氣是生命之源1. T: Now,lets play a game（憋氣游戲）.Look at the rules on the screen.2. 學生看游戲規則。3. T：Are you clear?4. S: Yes,were.5. T: Ok,stand up,timing begins.6. 學生開始游戲。7. T：Stop.8. T: What do you feel now?9. S: Uncomfortable.10. T: Can we survive without the air?11. S: No.12. T:Lets watch a video,then tell me how do you feel.13. S:生物離不開空氣、我們不能呆在密閉的空間里.14. T: Yes,We cant survive without the air.But.（ppt展示大氣污染圖片）15. 學生認真看圖片，教師解說： Air pollution is becoming more and more serious.If we dont stop,well have to breathe like this.Do you want to be like this?16. S: No!17. T: So,lets protect the environment together,ok?18. S: OK!19. T:Last，finish this homework after class.20. T:Class is over.【通過游戲、圖片等展示，意在引導孩子們發現我們的生存離不開空氣，倡導孩子們保護大家賴以生存的環境。】板書設計：- 6