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物理是一门实验为主的科学,而有些物理知识不够直观,学生掌握起来有一定的困难。第十章第五节“物体的浮与沉”在初中物理教学中是一个难点,包含大量的概念规律,而且题目灵活多变,学生单凭死记硬背无法理解掌握。采用题海战术则会浪费大量的时间和精力,所以,变式教学在这一节就显得尤为重要。讲解密度计时,同一个密度计漂浮在不同的液体里,比较两种情况浮力的大小并判断哪个杯子里液体的密度大,也可以采用变式教学。先通过理论分析得出结论,紧接
Physics is an experiment-based science, and some physical knowledge is not intuitive enough, students have some difficulty in mastering. The tenth chapter fifth “floating and sinking objects” in junior high school physics teaching is a difficult point, contains a large number of conceptual rules, and the subject is flexible, students can not understand the merit by rote. Adoption of the sea tactics will waste a lot of time and effort, so, variant teaching in this section is particularly important. Explain the density of time, the same density meter floating in different liquids, comparing the size of the two cases of buoyancy and determine which cup of liquid density, you can also use variant teaching. First through theoretical analysis to draw conclusions, immediately