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1、义务教育课程标准试验教科书三年级科学(上册)有趣的浮沉现象教案单位：凤凰镇路山小学姓名：路小芬15 有趣的浮沉现象教学目标：1、能用实验的方法比较物体在水中的浮沉；能对物体的浮沉提出猜想和假设；能通过实验验证自己的猜想和假设；2、培养合作、细致观察的学习习惯，能体会到科学探究要尊重证据；3、知道水有浮力，能举例说出浮力在生活中的应用。教学准备：材料盒（木块、石头、橡皮筋、曲别针、钩码、泡沫块）测力计、记录纸、笔。教学重点：能用实验的方法认识物体在水中的浮沉，知道水有浮力。教学难点：探究下沉的物体是否也受到水的浮力。教学过程：一、创设情境，激趣导入1设置悬念，提出问题同学们看，这儿有两个相同的正
2、方体，猜猜把它们同时放入水中会怎么样？（学生自由猜测）师演示大家看到了什么？为什么会出现这种现象？（学生大胆猜测）2揭开谜底，揭示课题谜底：两个相同的正方体中，有一个装有铁钉。这就是我们今天要研究的：有趣的浮沉现象（板书）二、猜测实验，亲历探究1探究浮沉现象文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC
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5、A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:
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8、T2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7(1)
9、提出问题：如果把材料盒里的材料放入水中，会出现什么现象？请各小组先猜测一下，把你认为沉、浮和不确定的物体在桌子上分开，并且要做好记录。（见实验记录表一）(2)学生分组活动。哪个小组想汇报一下你们的猜测结果？(学生汇报)(3)同学们都做了大胆的猜测，但是，怎样证明你的猜测是否科学？生分组做实验，填好实验记录单，师巡回指导。（4）教师总结2探究水的浮力（1）探究上浮的物体受到水的浮力在刚才的实验中，我们看到，许多物体放在水中会浮起来。那么它们为什么能浮起来呢？你能不能再做一次大胆的猜测？我们怎样能知道浮在水面上的物体是否真的受到水给它的力量呢？引导学生想到用手按浮在水面上的物体，体会手的感觉。（学
10、生分组做实验，进行感受。）学生交流实验感受，并说明道理。理解浮在水面上的物体会受到向上托的力，教师总结：物体在水中受到的这种向上托它的力，在科学上就叫做浮力。（2）探究下沉的物体也受到水的浮力提出问题：我们通过实验证明了浮在水面上的物体会受到向上托的力，那么完全沉在水中的物体会受到向上托的力吗？请说说自己的想法？（学生猜测、交流。教师统计猜想情况）小组内讨论一下，设计实验。交流实验方案。(学生汇报，教师根据学生的交流提出注意问题)学生按照实验方案进行实验，做好实验记录（实验记录表二）汇报交流，得出结论。总结：沉下去的物体也受到水对它向上托的力，这种力就是水的浮力。在文档编码:CC3I5P7Y7
11、U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8
12、F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V
13、7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7
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15、K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D
16、9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5
17、P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7水中不论是上浮的物体还是下沉的物体都受到了水的浮力。3探究沉浮的原理（1）既然物体都受到水的浮力，为什么有的物体在水中上浮，有的在水中下沉？（2）学生分组讨论（3）小组汇报讨论并小结：物体的重量大于受到的浮力，物体在水中就下沉；物体的重量小于受到的浮力，物体在水中就上浮。三、拓展应用，延伸课
18、外1引导学生认识水的浮力在生产生活中的应用。同学们在生活中感受过水的浮力吗？谁能举例说明水的浮力在生活中有哪些应用？2课后探究：动脑想想，动手试试怎样让鸡蛋悬浮在瓶子的中央？文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3
19、I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10
20、P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A
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22、C3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE
23、10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT
24、2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7实验记录表一物体名称我的猜想实验结果浮沉浮沉木块石头橡皮筋曲别针钩码泡沫块提示：在相应栏中
25、打“”；如果不确定可以画“0”实验记录表二沉入水中的物体也会受到水的浮力吗？物体名称沉入水中之前拉下几格沉入水中之后拉下几格钩码文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 Z
26、T2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编
27、码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6
28、 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2
29、 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文
30、档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7
31、U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8
32、F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V
33、7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7
34、Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4
35、K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D
36、9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5
37、P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7文档编码:CC3I5P7Y7U6 HE10P3J4K8F2 ZT2A1V5D9V7