青岛版小学科学《钻木取火》精品教案.doc

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1、青岛版小学科学钻木取火精品教案钻木取火目标导教案例青岛版小学科学钻木取火精品教案一、 教学准备1、教师课前让学生搜集有关钻木取火的资料。2、教师准备槐木、梧桐木、砂纸、铁条、绳子、火柴、有关钻木取火的图片或文字资料等二、 教学目标1、通过摩擦生热的实验，培养学生的实验能力和归纳概括能力2、通过教学使学生意识到科学技术会给人类与社会发展带来好处，也可能产生负面影响，乐于用学到的科学知识改善生活。3、知道钻木取火运用的是摩擦生热的道理，了解人类用火的历史。三、教学过程(一)导入新课教师可以引导学生交流有关钻木取火的话题，导入新课。板书：11、钻木取火（二）探究新知1、钻木取火的实验教师指导学生模仿

2、古人钻木取火。方法：选择比较硬的条状木头（如槐木），把木头的下端用刀子削尖；再选择比较软的木头（如梧桐木），用小刀剜一个小洞，平放于桌上，再用绳子缠在槐木上，用一个比较硬的东西顶住槐木上端，让学生一边一个来回拉，观察现象。如图：2、质疑猜想（1）让学生用能量转化的观点解释钻木取火的道理。 （2）教师参考资料：摩擦会产生热量，也就是摩擦生热。3、实验验证（1）选择实验材料，验证摩擦会产生热量，即摩擦生热。（2）学生做实验。搓手；用砂纸打磨铁条；在黑板上摩擦火柴；（3）交流实验现象，用能量转化的观点解释其中的道理。教师参考资料：机械能能转化为热能。（三）科学与生活1、生活中有哪些机械能转化为热能的

3、现象。教师可根据课本上的图片资料或自己收集的资料，了解生活中机械能转化为热能的现象。并启发学生用能量转化的观点解释生活现象。2、讨论“摩擦生热”的利与弊。利：冬天双手摩擦可以产生热量，使手变的暖和。弊：高速行驶的汽车容易爆胎；手钻工作时，钻头会很热，导致钻头损坏等重点讨论：摩擦生热给我们的生活带来的负面影响，商量解决的办法，提出自己的设想和建议。3、机械能除了转化为热能以外，还可以转化为什么？让学生根据生活经验，交流机械能转化为电能、光能、生能等方面的例子。使学生意识到能量之间的转化是多角度的。四、拓展延伸查阅资料，继续了解古代人用火的方法和历史。结束语！祝大家学到有用的知识，提升自己的能力，

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