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幼儿园幼小衔接教师:科学:神奇的纸教案+PPT课件备课图片

  • 2026-08-22 05:18:36
幼儿园幼小衔接教师:科学:神奇的纸教案+PPT课件备课图片

幼小科学:神奇的纸

 活动目标

1.知道纸经过加工后可以变成其它功能。 

2.在教师指导下对普通的纸进行简单加工与改进,比较材料在改变前后的变化。 

3.在教师指导下,能用语言描述纸在折叠前后的变化。

活动准备:白纸若干、纸的变化图。

活动过程:

1.交流导入

(1)交流纸的特点。 

教师出示一张白纸,请幼儿说一说,这张纸有什么特点? 

小结:纸很薄,很轻,是白色的。

 (2)交流纸的用途。 

师:生活中我们可以用纸来做什么?

小结:生活中我们可以用纸写字、画画、做手工…… 

(3)引发对纸的畅想。 

师:我们有什么办法可以让纸具有更多神奇的本领?

 2.探索 

(1) 了解改造纸的方法

师:请你们想想,我们可以用什么方法改变一张白纸?让它变得更漂亮或者有其它用途?

小结:用折叠、染色、刷油…… 这些方法都能把白纸变得更漂亮,更有趣。 

(2)师:今天我们就用折叠的方法来尝试改变白纸,看看改变后的白纸会有哪些新的功能 

3.探究改变形状后纸的新功能 

(1)学习折叠瓦楞形;

(2)比较折叠成瓦楞状纸前后纸的变化;

师:白纸折叠后与原来的白纸相比有什么变化? 

小结:白纸折叠这成的这种形状叫瓦楞状,我们叫瓦楞状纸。 

4.探索瓦楞状纸的功能和本领。

(1)请幼儿将白纸与瓦楞状纸分别平放在桌面上,用手轻轻按一按白纸和瓦楞状,体验手心的感觉,将感受记录在观察记录表内。 

(2)放一放:取两本厚一些的书,以间隔一定的距离平放在桌面上,先将一张白纸放在两本书上,接着由轻到重将物体(可以选择身边轻重不同的物体,如回形针、橡皮)放在纸的正中间,看纸能否承受得住以及能承受多重的物体。测完白纸后,再去测瓦楞状纸,看看能承受多少重量,记录在记录在观察记录表内。 

摸一摸:领取一杯热水,用白纸贴着杯子感受冷热程度;换用瓦楞状纸,再次感受冷热程度,并对比有什么区别。记录在记录在观察记录表内。 

小结:白纸做成瓦楞状纸后变的比白纸受重和隔热效果好些了。

六.活动延伸:

幼儿在科学区学做幼儿用书p10页的折纸,想想为什么纸会站起来。

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  1. CONNECT:[ UseTime:0.001170s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001695s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000832s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000777s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001460s ]
  6. SELECT * FROM `set` [ RunTime:0.000640s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001440s ]
  8. SELECT * FROM `article` WHERE `id` = 525119 LIMIT 1 [ RunTime:0.009219s ]
  9. UPDATE `article` SET `lasttime` = 1787592744 WHERE `id` = 525119 [ RunTime:0.039256s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000691s ]
  11. SELECT * FROM `article` WHERE `id` < 525119 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001355s ]
  12. SELECT * FROM `article` WHERE `id` > 525119 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006963s ]
  13. SELECT * FROM `article` WHERE `id` < 525119 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004190s ]
  14. SELECT * FROM `article` WHERE `id` < 525119 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018730s ]
  15. SELECT * FROM `article` WHERE `id` < 525119 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009259s ]
0.312915s