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探索性实验,就是通过学生动手实验,探索某一规律或得出某一结论。其形式是实验在前,结论在后。此种方法能激发学生的学习兴趣,充分发挥学生的主体作用。笔者在教学小学自然第三册《水的压力和浮力》一课时,运用探索性实验的方法教学,收到了较好的效果。1 质疑导入,激发兴趣 接触新课之前,根据已学知识提问:什么叫水的浮力?学生很快回答后,教师出示幻灯,轮船在水面上行驶,接着演示,小颗铁钉沉入水底。然后设计提问:为什么万吨巨轮能浮在水面上,而小颗铁钉却会沉入水底呢?这样学生兴趣盎然,刨根问底,情绪很快被调动起来了。2 逐层深入,揭示规律
Exploratory experiment, is through students experiment, to explore a certain law or draw a conclusion. Its form is the experiment before, the conclusion is behind. This method can stimulate student interest in learning, give full play to the student's main role. The author in the teaching of primary third volumes of “water pressure and buoyancy,” a lesson, the use of exploratory experimental methods of teaching, received good results. 1 questioned the introduction, to stimulate interest in contact with the new lesson, according to the learned knowledge questions: What is the buoyancy of water? Students quickly answer, the teacher showed the slide, the ship on the water, and then demonstrated that small nails sink to the bottom. Then design the question: why thousands of tons of wheels can float on the water, while the small nails will sink into the water it? So full of interest students, asking the root questions, emotions soon be mobilized. 2 layer by layer, revealing the law