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凹凹凸凸的镜子_科学教案_小班_PPT课件

  • 2026-04-19 22:04:32
凹凹凸凸的镜子_科学教案_小班_PPT课件

幼儿园课件套餐

凹凹凸凸的镜子

(凹面镜、凸面镜)

小班 科学

活动目标

体验探索凹、凸面镜成像的乐趣。

感知凹、凸面镜不同的成像特点。

能积极参与探索,认真观察并尝试描述现象。

活动准备

课件准备:“卷一卷”组图;“成像”组图;“凹凹凸凸”组图。

材料准备:剪裁好的镜面纸,人手一份。

活动过程

出示实物“镜面纸”,引导幼儿初步感知镜面纸的特点,引出活动主题。

——今天,老师给大家带来了一个好玩的材料,叫做镜面纸。看看它有什么特别的呢?(亮亮的、滑滑的、像镜子一样)

活动建议:教师拿着镜面纸依次在全体幼儿面前展示,引导幼儿感知镜面纸的特点。

小结:镜面纸能像镜子一样照出我们的样子。

出示组图“卷一卷”、“成像”,引导幼儿探索感知凹、凸面镜不同的成像特点。

活动建议:1.教师提前将亮银色镜面纸剪裁好放在小篮子里,置于幼儿椅子下方。2.材料不要有折痕、弯曲等,尽量完全平面,教师也可使用亮银色反光卡纸等材料替代。

1.出示图片“卷一卷”,教师介绍操作要求并示范操作。

——老师给每位小朋友都准备了一张镜面纸,现在请你们从椅子底下拿出镜面纸。

——镜面纸不仅能照出我们的样子,它还有一个特别好玩的地方。请你们像老师这样轻轻地把纸往里凹或往外凸,再横着、竖着照一照自己,看看会发生什么呢?

2.幼儿自由探索,教师巡回指导。

活动建议:1.教师提醒幼儿不要过度弯曲或对折镜面纸。2.探索结束后,请幼儿先将镜面纸放回到小篮子里,再分享结果。分享时,教师可另外提供一张镜面纸供幼儿展示。

3.出示组图“成像”,师幼共同分享、交流。

——谁来说说,刚刚你是怎么照的?镜面纸里的你发生了什么变化?请你给大家展示一下吧!(把镜面纸往外凸,竖着照,照出来的自己变得细细长长的……)

——其他小朋友有没有不一样的发现呢?

活动建议:教师请幼儿分享各种凹、凸面镜照的方式及其成像效果。若有个别效果幼儿没有探索出来,如凹面镜竖着照时会左右颠倒,教师可现场操作请幼儿观察现象,并出示图片帮助幼儿拓展经验。

——除了刚刚小朋友们发现的这些变化,老师也有一个不一样的发现。看看我是怎么照的?(把镜面纸往里凹,竖着照)

——照出来的我有什么不一样呢?看看老师头歪的方向和镜面纸里的一样吗?

——我们把镜面纸轻轻地往里凹,竖着照,会照出相反的、细细长长的自己。

小结:把镜面纸轻轻往外凸,横着照出来的自己会变得宽宽扁扁的;竖着照出来的自己会变得细细长长的。把镜面纸轻轻往里凹,横着照出来的自己是倒的,还会变得宽宽扁扁的;竖着照出来的自己是相反的,还会变得细细长长的。

4.复用组图“成像”,鼓励幼儿再次探索。

——刚刚小朋友们还有几种方法没有尝试过,接下来你们可以再去试一试,看看能不能发现这些有趣的变化。

活动建议:教师可结合图片上照镜面纸的方式引导幼儿再次探索并观察相应的成像效果。发放操作材料、出示组图“凹凹凸凸”,鼓励幼儿进一步感知凹、凸面镜成像的不同,体验活动的乐趣。

发放操作材料、出示组图。。。

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  1. CONNECT:[ UseTime:0.000365s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000503s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000259s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000509s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 462899 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1776667004 WHERE `id` = 462899 [ RunTime:0.009962s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002866s ]
  11. SELECT * FROM `article` WHERE `id` < 462899 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001006s ]
  12. SELECT * FROM `article` WHERE `id` > 462899 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002155s ]
  13. SELECT * FROM `article` WHERE `id` < 462899 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002982s ]
  14. SELECT * FROM `article` WHERE `id` < 462899 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008291s ]
  15. SELECT * FROM `article` WHERE `id` < 462899 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009495s ]
0.107819s