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幼儿园大班科学活动:沉与浮(教案)

  • 2026-04-13 11:40:28
幼儿园大班科学活动:沉与浮(教案)

大班科学活动:沉与浮(教案)

活动目标1.激发幼儿探索的欲望。2.能够了解物体的沉浮现象,记录操作结果。3.初步大胆尝试,探索让下沉的物体上浮。活动重点:能够了解物体的沉浮现象,记录操作结果。活动难点:初步大胆尝试,探索让下沉的物体上浮。活动准备1.经验准备:了解物体的沉浮现象,会记录实验结果。2.物质准备:a.各种实验材料(瓶盖、橡皮泥、雪花片、泡沫、回形针、橡皮泥、木块、钉子、记录表、操作盒子)人手一份。b.自制幻灯片。
 活动过程  一、 激发幼儿兴趣,感知物体的沉与浮的现象1.师:小朋友今天老师要和大家一起做实验了,这里我为大家准备了很多的操作材料有:水、瓶盖、橡皮泥、雪花片、泡沫、回形针、橡皮泥、木块、钉子、记录表。请小朋友试一试,看一看哪些物体会沉下去?那些物体会浮上来?用符号标记。2.师:在操作时请小朋友注意以下几点:a.请小朋友把你的记录结果记录到记录纸上;b.操作时请小朋友尽量不要把水洒到桌子上;c.每一种材料都要尝试。3.师:教师巡回观察幼儿的操作结果,并对于个别操作较慢的幼儿进行指导和鼓励。4.师:并现场验证幼儿猜测的正确与否。对不同意见(如同一种物体,有的幼儿认为沉,有的幼儿认为浮)通过实验验证,统一认识。5.师小结:我们通过操作后发现金属类的物体放入水中会下沉像(回形针、钉子、硬币)木质和塑料类的物体放入水中会上浮像(泡沫、筷子、木块、雪花片、瓶盖)。由此可见,物体在水中的沉浮与物体本身的材料有关。  二、 尝试探索如何让沉下去的物体浮上来1.师:刚才的结果中我们都看到了,物体在水中的现象都是不一样的,接下来老师要加大难度了,请小朋友尝试操作,如何让下沉的物体上浮?看看有什么样的办法。(有的是通过借助外力,还有的是改变自身形状)一起来探索。2.师:鼓励幼儿尝试操作,教师巡回指导。3.师小结:我们发现橡皮泥浮起来了,实心的橡皮泥放入水中会下沉,但是我们通过改变它的形状,由原来的下沉变成了现在的上浮。橡皮泥在自身比重不变液体密度不变的情况下,它排开液体的体积变大了。它就会浮在水面上了。在此环节中渗透了有关浮力的知识,引导幼儿对浮力有一个初步的了解,同时,潜移默化地熏陶幼儿对有关浮力的了解。  三、迁移生活经验,寻找生活中的浮力现象  观看课件,轮船、游泳圈、竹筏等。  活动延伸  师:小朋友们,我们知道改变橡皮泥本身的形状可以让原本下沉的物体上浮。那你找一找你的身边还有什么物体也可以这样来操作?大家搜集一下,然后通过实验的方法自己来试一试,看一看吧。

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  1. CONNECT:[ UseTime:0.000531s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000755s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000464s ]
  6. SELECT * FROM `set` [ RunTime:0.000190s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000476s ]
  8. SELECT * FROM `article` WHERE `id` = 462888 LIMIT 1 [ RunTime:0.000608s ]
  9. UPDATE `article` SET `lasttime` = 1776667108 WHERE `id` = 462888 [ RunTime:0.006227s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 462888 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000529s ]
  12. SELECT * FROM `article` WHERE `id` > 462888 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000388s ]
  13. SELECT * FROM `article` WHERE `id` < 462888 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000889s ]
  14. SELECT * FROM `article` WHERE `id` < 462888 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000731s ]
  15. SELECT * FROM `article` WHERE `id` < 462888 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000808s ]
0.084592s