小学科学教育科学五年级下册沉和浮whatfloats？whatsinks？董雯雯

1、What floats？What sinks？教学设计 董雯雯教学目标学科目标：1、让学生知道有的物体在水里浮，有的物体在水里沉 2、让学生知道改变同种材料物体的大小轻重，沉浮不变语言目标：掌握float和sink两个核心词汇。 能运用句型 (I think) can float. (I think) can sink.教学重难点重点：（学科）学生能通过实验验证自己的猜测。（语言）80%以上的学生能运用句型(I think) can float/sink.难点：（学科）学生通过2个有层次的实验得出结论：物体沉浮与本身材料有关。（语言）学生能用英语表达物体的沉浮与轻重无关。教学准备 PPT、词卡

2、、各小组一套实验材料，一个水槽。教学流程1.引入引出float 和 sink两个单词。T: What can you see in the picture?S：Boy、duck、stoneT: Yeah can ducks float or sink?S：Ducks can float.T：What about stone?S：Stones can sink.T：Can boat float or sink?S: Boats can floatT：Today we are going to learn what floats? What sinks?2.介绍沉浮现象T：Before we le

3、arn it we should know what is called float and what is called sink, please look at picture. The purple one ,the green one, the yellow one are float, only the red one is sink. Only when the object touch the bottom, thats the sink.3.预测十种物体在水中的沉浮Activity 1：10种物体的沉浮实验T: There are 10 objects for each gro

4、up, look at the screen, do you know them?(依次介绍pencil sponge apple foam eraser clip coins box chopsticks spoon )Which one will float，which one will sink？Can you guess?S：猜测，T引导学生使用I think can float/sink。T：You can talk with each other，and write down your thinking。学生分组讨论，记录自己的猜测。学生汇报自己的猜测,T：Well, maybe

5、your guess is true ,maybe your guess is false ,what can we do to prove it?S: Do the experiment.4.实验并记录Activity2:T: Before we check our answer we should know how to do the experiment in the right way.T: Can we throw it in water? We should put it in the middle of water and then let is go. And we shoul

6、d put it one by one, now you can put them in water, then complete the paper.学生实验，教师巡视T：which group want to try？交流汇报，引导学生使用句型_can float/sink.并让学生依次把材料的卡片归类,并作相应的演示。总结Now we know：Some objects can float. Some objects can sink.5.实验改变物体大小轻重沉浮不变Activity 3T：We already know wood can float in water, and we h

7、ave three different size of wood. The small one, the medium one, the large one. If we put it in water. What will happen?S：学生猜测:I think _floats/sinksT：Oh you have different ideas, what should we do?S:Do the experiment.T:OK you can do an experiment to prove .do you want to try？Take the sticks，then you can do the experiment ,remember to complete the paper.学生实验。交流汇报6.做实验证明有的轻的物体会沉，有的重的物体会浮:Compare the log and the tiny stone.Some light objects floatSome heavy objects sink总结Today we know：Some objects can float. Some objects can sink.Some light objec