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【一等奖小学科学教学论文】“诊·仿·创”小学科学模型建构教学实践——以《制作红绿灯》为例

【一等奖小学科学教学论文】“诊·仿·创”小学科学模型建构教学实践——以《制作红绿灯》为例

“诊·仿·创”小学科学模型建构教学实践

——以《制作红绿灯》为例

模型建构是通过设计、推理等手段,主动构建起对客观事物或现象的抽象化模拟,从而深入理解科学概念和原理的过程,能促进学生对科学本质的理解,是实现思维可视化、进阶化的关键路径。拓展课《制作红绿灯》是四年级“电路”单元的延伸内容,以学生上下学时校门口拥堵现象为情境,引导他们运用所学的电路知识,设计并制作一个红绿灯来解决问题。实践中,我们探索出“诊·仿·创”三阶教学策略,将模型建构教学拆解为三个相互关联、层层递进的阶段。

01

一、诊—问诊模型,激活思维动能

“诊”是课堂教学的起点。教师创设真实问题情境,引导学生在已有认知与任务要求之间产生认知冲突。该环节的核心价值在于激活学生的思维动能,使其从被动学习者向主动探究者转变。在问诊过程中,学生要明确做什么,需要解决什么问题。

(一)诊中问疑:在认知冲突中唤醒原有认知

课堂伊始,教师提出用红绿灯解决拥堵问题,学生基于已有知识回答:“我们学过简单电路,可以用一个开关来控制一盏灯。”于是设计出了用三个开关分别控制红、黄、绿灯的并联电路(如图1)。教师肯定了学生积极思考,并让他们在白板上进行实物演示,当合上开关1时红灯亮、合上开关2时黄灯亮、合上开关3时绿灯亮,三个开关都合上时三盏灯同时被点亮。学生说道:“如果三盏灯同时亮,容易出交通事故!”教师随后出示真实的交通信号灯图片及短视频,引导学生仔细观察。

1三开关控制的并联电路

师:生活中红绿灯是怎么工作的?

生:红灯亮时,黄灯和绿灯灭;绿灯亮时,红灯和黄灯灭,它们是交替工作的。

师:刚才我们设计的红绿灯能达到这样的效果吗?

生:好像不行,一个开关能单独控制一盏灯亮或灭,无法实现切换。

生:我们需要点亮一盏灯时,另外两盏灯不亮。

师:现在请你们担任小小工程师,设计一个红绿灯,要求点亮一盏灯时,另外两盏灯不会同时被点亮。

教师不急于评判对错,而是引导学生思考:要实现红绿灯交替工作,需要解决哪些核心问题?小组讨论后,学生梳理出两大关键要点:一是通过开关控制对应灯点亮;二是避免其余两盏灯同步被点亮。学生从搭建单盏灯具的简易电路,过渡到三灯交替发光的复杂电路,在认知困惑中锁定核心突破口—改进开关。学生的思维得以充分激活,不再被动等待标准答案,而是主动探究、自主解决问题。

(二)诊中求解:在方案设计中激活思维引擎

明确问题后,教师出示材料图片,引导学生进行“头脑风暴”,大胆设计解决方案。学生以小组为单位,画出设计图,并标注电路连接方式。各小组的设计方案呈现出明显的思维差异。

师:下面哪个小组来介绍一下你们的方案。

生:我们组设计的是“三个单刀单掷开关并联”方案,三个开关分别控制红黄绿灯,我们准备再用一个装置来控制这三个开关不能同时被按下。

师:很有创意,那这个控制装置要怎么设计?

(学生陷入思考中。)

生:我们组设计的是“一个单刀三掷开关”方案(如图2),回形针的一端用图钉固定,连接电源正极,另外三个图钉分别连接红、黄、绿灯,回形针可以灵活转动。开关拨到哪边,哪边的灯就亮。

师:这主意很棒,能具体说明一下吗?

生:当回形针一端向上拨动连接图钉时,红灯亮,其他两盏灯不亮;另外两个点连接时,也能达到同样的效果。

2单刀三掷开关控制电路

诊中求解助推学生完成从思路模糊到形成具体方案、从发散思考到聚焦问题解决的思维进阶。学生在方案研讨的过程中意识到,设计方案仅停留在理论层面,实际效果还需要通过实验验证,由此初步形成工程思维。

02

二、仿—仿真模型,培育创新思维

“仿”是课堂教学的关键。该环节引入虚拟实验,让学生在虚拟场景中验证设计方案、厘清电路原理。虚拟实验具备可视化、可反复操作等优势,可直观呈现抽象的电流路径,助力学生攻克学习重难点。“仿”并非简单复刻操作,而是依托模拟操作深化理解、通过仿真推演开展创新,推动学生完成从具象实操到抽象原理归纳的思维跃升。

(一)仿中探理:在虚拟实验中突破学习重难点

完成初步设计后,学生并未直接搭建实物电路,而是打开中央电化教育馆虚拟实验软件,进入“制作红绿灯”仿真界面,按照自主设计方案搭建虚拟红绿灯电路。沉浸式仿真操作加深了学生对电路接线逻辑的理解,为后续实物模型搭建筑牢基础。

学生在虚拟实验中借助图钉、回形针自制单刀三掷开关并接入电路:将回形针拨至绿灯一侧图钉时,电流从电源正极流出,经导线、绿灯、开关流回电源负极,形成完整闭合回路,绿灯随即被点亮(如图3)。按同样的方法完成黄灯、红灯电路搭建后,均可实现预期切换效果。

.............

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  1. CONNECT:[ UseTime:0.000927s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001430s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000714s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001335s ]
  6. SELECT * FROM `set` [ RunTime:0.004201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001491s ]
  8. SELECT * FROM `article` WHERE `id` = 974759 LIMIT 1 [ RunTime:0.001098s ]
  9. UPDATE `article` SET `lasttime` = 1787961396 WHERE `id` = 974759 [ RunTime:0.080507s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002059s ]
  11. SELECT * FROM `article` WHERE `id` < 974759 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001194s ]
  12. SELECT * FROM `article` WHERE `id` > 974759 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001026s ]
  13. SELECT * FROM `article` WHERE `id` < 974759 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003239s ]
  14. SELECT * FROM `article` WHERE `id` < 974759 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.079515s ]
  15. SELECT * FROM `article` WHERE `id` < 974759 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002651s ]
0.406575s