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小学科学《磁铁有磁性》教资面试试讲逐字稿真题练习

  • 2026-03-14 15:00:11
小学科学《磁铁有磁性》教资面试试讲逐字稿真题练习

《磁铁有磁性》试讲逐字稿

面试真题解析

开场白

尊敬的各位评委老师,大家好!我是面试小学科学教师的XX号考生,今天我试讲的课题是《磁铁》,下面开始我的试讲。

一、魔术导入,激发兴趣

小朋友们,上课!请坐。

小朋友们,你们喜欢看魔术表演吗?哇,大家眼睛都亮了!今天老师就给大家表演一个超级神奇的魔术。你们看好了哦——老师手里有个小玩具小车,还有一根棍子。老师要让这个小车自己挂在棍子上,不用手扶!准备好了吗?看我的!(师表演魔术:用裹着白纸的磁铁靠近铁制玩具小车,小车“啪”地挂住了。学生惊呼)哎呀!真的挂住了!太神奇了吧?谁能猜猜,这里面藏着什么秘密?(指名学生)

哦,你说可能是因为棍子上有磁铁!哇,你猜得太准了!真聪明!还有谁有不同想法?这位小朋友说可能是胶水?哈哈,想法很棒,但咱们来验证一下。小朋友们,想不想自己动手玩一玩磁铁,让物体自己“飞”起来?今天,我们就一起来探究磁铁的秘密!(板书课题:磁铁,全班齐读两遍)

二、自主探究,获取新知

(一)活动一:磁铁能吸引什么物体

小朋友们,老师给每组都准备了好多小材料:铁钉、铝片、铜片、塑料片、木块、回形针、布条……现在,先别急着玩,先来猜一猜:哪些东西会被磁铁吸引?哪些不会?请你们小组讨论,把猜会吸引的放一堆,不会吸引的放另一堆。记录员把结果记在记录表上。材料员小心拿材料哦,铁钉和铝片有点尖,要注意安全!(学生小组猜测、分类,师巡视指导)好,大家猜完了!哪个小组愿意先来汇报你们的猜测?(指名小组汇报)

哦,你们组觉得铁钉、回形针会被吸引,铝片、塑料片、木块不会。记录得真清楚!请坐。这些只是我们的猜测,到底对不对呢?我们该怎么办?(学生:做实验验证!)

对呀!太聪明了!实验才是检验真理的最好办法。大家掌声鼓励自己!现在,材料员上台领磁铁。每组轮流实验,试一试每个物体,看看磁铁能不能吸住。实验完,记录员记好结果,其他同学观察。开始吧!(学生实验,师巡视、参与、提醒安全)哪个小组先来汇报实验结果?(指名汇报)

哦,你们组发现铁钉、回形针被吸住了,铝片、塑料片、木块、布条、铜片都没被吸住。实验做得真认真!现在,大家看黑板(师根据汇报移动卡片)。请小组讨论:能被磁铁吸引的物体有什么共同特点?(小组讨论)

谁来分享?这位小朋友说:它们都是铁做的!太棒了!对!我们发现:磁铁能吸引铁制成的物体。科学家就把这个本领叫做——磁性!(板书:磁性 磁铁能吸引铁制成的物体)

(二)活动二:磁铁能隔着物体吸铁吗

哇,刚才我们知道了磁铁能吸铁。那如果中间隔着东西呢?老师这里有木片、纸片、塑料片、铝片、布片。你们猜猜,磁铁隔着这些东西还能吸住铁钉吗?(学生猜测)

哦,你说隔着纸片能,隔着铁片不能?想法很棒!现在,每组从材料袋里选一种喜欢的物体,放在磁铁和铁钉中间试一试。记录员记好。开始!(学生实验,师巡视)哪个小组汇报?(指名汇报)

哦,你们组试了纸片、木片、塑料片,都能吸住!铝片也行,但布片有点厚,吸得慢一点。汇报得真清楚!从大家的实验看,你们发现了什么?(学生:磁铁隔着一些物体还能吸住铁!)

对!磁铁隔着一些物体能吸住铁。(板书:磁铁隔着一些物体能吸住铁)这里的“一些物体”主要是指非铁材料做的。因为如果隔着铁,情况比较复杂,以后我们再研究。感兴趣的小朋友可以回家试试,把结果告诉老师,好吗?

(三)活动三:哪些硬币是铁做的

小朋友们,可爱的小兔子遇到难题了!(出示PPT:一堆硬币)她想知道哪些硬币里有铁,可她不会分辨。你们愿意帮忙吗?先猜猜看,哪些硬币会被磁铁吸住?(学生猜测)

哦,你们觉得1元硬币、5角硬币会被吸,1角的不会?猜得真有道理!有没有更好的办法?

(学生:用磁铁试!)

对呀!磁铁能吸铁的,我们就知道里面有铁了!材料员上台领材料:一块磁铁和7枚不同硬币。小组实验,看哪些硬币被吸住。(学生实验,师参与)谁来说说结果?(指名)

哦,你们发现1元硬币和5角硬币被吸住了,1角、5分、1分没被吸住。太细心了!为什么有的硬币能被吸,有的不能?(出示PPT:硬币成分表)看,1元和5角里有铁,其他主要是铜、镍、锌。原来硬币成分不同啊!

三、总结全文,拓展延伸

小朋友们,这节课我们有哪些大发现?(指名畅所欲言)

哦,你说磁铁有磁性,能吸引铁做的物体,还能隔着一些东西吸铁。说得真全面!老师现在也遇到难题:我把一枚回形针掉进装满水的塑料杯里了,不能碰到水,怎么取出来?(学生:用磁铁贴着杯壁慢慢往上移!)

对!来,谁来演示?(指名学生演示或师示范)太神奇了!磁铁的秘密真多。课下继续玩磁铁,发现更多秘密,回家告诉老师,好吗?今天的课就到这里。下课!小朋友们,再见!

板书设计参考:

磁铁

磁性磁铁能吸引铁制成的物体

磁铁隔着一些物体能吸住铁

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  1. CONNECT:[ UseTime:0.000673s ] mysql:host=127.0.0.1;port=3306;dbname=no_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000923s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000291s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000219s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000545s ]
  8. SELECT * FROM `article` WHERE `id` = 462606 LIMIT 1 [ RunTime:0.008377s ]
  9. UPDATE `article` SET `lasttime` = 1773523869 WHERE `id` = 462606 [ RunTime:0.012904s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005330s ]
  11. SELECT * FROM `article` WHERE `id` < 462606 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000497s ]
  12. SELECT * FROM `article` WHERE `id` > 462606 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001717s ]
  13. SELECT * FROM `article` WHERE `id` < 462606 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000787s ]
  14. SELECT * FROM `article` WHERE `id` < 462606 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001158s ]
  15. SELECT * FROM `article` WHERE `id` < 462606 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013210s ]
0.111985s