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初二学生物理成绩的分化现象通常是比较严重的.初二物理有不少重点、难点.我认为既是重点又是难点的部分就是分化点.如力(力的分析、力的图示、力的单位)、密度、压强、功等重要概念,牛顿第一定律、液体内部压强公式、阿基米德定律、物体浮沉条件、杠杆平衡条件、功的原理等重要规律,都是初二物理的分化点.力的概念贯串整个力学部分.密度的掌握与运用直接影响到第五章浮力的教学,压强贯串第五、第六章.功的概念不仅关系到功率,机械效率的教学,也关系到初三物理热和功、电功、电功率的教学.忽视这些分化点的教学,将导致相当数量的中等程度的学生掉队.
The divergence of the physical performance of junior high school students is usually more serious. The second day of physics has many important and difficult points. I think that the focus is the difficult part is the differentiation point. Such as force (force analysis, force icon, force The important concepts such as unit, density, pressure, and work, Newton’s first law, liquid internal pressure formula, Archimedes’ law, object floatation condition, lever balance condition, work principle and other important laws are physical Differentiating point. The concept of force runs through the entire mechanics. The mastery and use of density directly affects the teaching of buoyancy in Chapter 5, and the pressures run through Chapters 5 and 6. The concept of work not only relates to the teaching of power, mechanical efficiency, but also to the The teaching of physical heat and work, electric power, and electric power until the third year. Ignoring the teaching of these differentiation points will lead to a considerable number of students who are behind in middle school.