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幼儿园幼小衔接教师:科学:自制喷泉教案+PPT课件备课图片

  • 2026-06-14 16:11:51
幼儿园幼小衔接教师:科学:自制喷泉教案+PPT课件备课图片

幼小科学:自制喷泉

活动一

一、材料准备:两个大一些的空饮料瓶(如雪碧瓶)、大头钉、水 

    制作方法: 

    (1)在一个雪碧瓶的瓶身一侧竖排用大头钉扎若干个直径大小相同的小孔。 

    (2)在另一个雪碧瓶的瓶盖上扎数个直径大小不同的小孔。 

    实验操作: 

    (2)让幼儿在第二个瓶子中也装满水,并拧紧瓶盖,然后用力挤压瓶身,水会象喷泉一样从上面喷出来。 

    教师指导建议: 

    ●操作第一个瓶子时,教师要注意引导幼儿观察哪个小孔喷出的水射得远,哪一个小孔喷出的水射得近,请幼儿记录自己观察到的结果。 

    ●操作第二个瓶子时,教师要引导幼儿感受用力大小对形成喷泉大小的影响。 

    拓展与替代:有条件的幼儿园可带领幼儿观察户外喷泉。 

    科学小知识 

水的压力由水的深度决定,水越深,水压就越大;水越浅,水压就越小。所以,在瓶身上的小孔直径相同的情l)下’从瓶子底部喷出的水喷射得最远,顶部喷出的水射出的距离最近。此外,当用力挤压瓶身时,瓶子中的水同时受到压力的影响,从大小不同的小孔中喷射出来。挤压越用力,水压越大,喷泉越大。

活动二

二、材料准备:两两相同的矿泉水瓶若干(瓶口大小不一)、沙子、秒表 

    制作方法: 

    (1)两个相同的矿泉水瓶为一组,在其中一个矿泉水瓶中装入适量的沙子。每组瓶子中装入的沙子数量不变。 

    (2)分别将每组矿泉水瓶的瓶口相对并用透明胶带扎紧,可以在瓶身做简单的装饰,沙漏即制作完成。 

    实验操作: 

    (1)请幼儿倒转一组沙漏,观察沙子的流动,记录沙子流完的时间。 

    (2)请幼儿同时倒转多个瓶口大小不等的沙漏,比较它们流完的不同时间。 

    或者 

    (1)教师在制作沙漏时,用剪刀在瓶盖上戳洞,洞有大有小,可以有两个或三个洞。(见“自制沙漏图1”) 

    (2)在同时倒转沙漏的过程中,请幼儿观察、比较瓶盖眼大小与沙子流速的关系。 

    教师指导建议: 

    ●定期检查沙漏,避免沙漏漏沙。 

    ●可以请幼儿自选沙漏进行比赛,看谁的沙漏沙子流得速度快,提醒幼儿要同时倒转沙漏,确保实验效果的准确性。 

    ●注意引导幼儿观察沙子的流速,并能记录观察到的结果。 

    ●鼓励大班幼儿自制沙漏。 

    ●搜集资料向幼儿介绍沙漏的历史,知道沙漏是古代的一种计时工具。 

    拓展与替代: 

    ◆在沙漏中放入小米、绿豆或黄豆等谷粒制作成米漏。 

    ◆请幼儿同时倒转米漏,观察不同瓶口谷粒流动的速度。 

    附科学小知识 

    给沙子一个外力,沙子就能流动起来,不断地翻转沙漏就等于给了沙子一个外力,所以沙子能够流动起来。沙子的流速与沙漏瓶口的大小和瓶盖眼的数量、直径大小有关:瓶口越大、瓶盖眼越多且直径越大,流速越快;瓶口越小、瓶盖眼越少且直径越小,流速越慢。 

    沙漏也叫做沙钟,是一种测量时间的装置。沙漏由上下两个相同的瓶子组成,中间用狭窄的连接管道连在一起,上部瓶子所蛊的细沙通过中间细管慢慢流入底部瓶子中,这一过程所需要的时间可以被用来对时间进行测量。一旦所有的沙子都流到底部瓶子里,该沙漏就可以被颠倒以测量时间了。这种沙漏的优点是可以两面使用,翻过来,底部就可以成为上部继续使用。

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  1. CONNECT:[ UseTime:0.000417s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000585s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000324s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000554s ]
  6. SELECT * FROM `set` [ RunTime:0.000255s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 508976 LIMIT 1 [ RunTime:0.000463s ]
  9. UPDATE `article` SET `lasttime` = 1781881411 WHERE `id` = 508976 [ RunTime:0.000787s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000315s ]
  11. SELECT * FROM `article` WHERE `id` < 508976 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000530s ]
  12. SELECT * FROM `article` WHERE `id` > 508976 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 508976 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006414s ]
  14. SELECT * FROM `article` WHERE `id` < 508976 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018020s ]
  15. SELECT * FROM `article` WHERE `id` < 508976 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013367s ]
0.115767s