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有关比例的题目是物理试题中最常见的类型之一,它涉及到热学、力学、电学的大部分章节。由于学生在数学方面的知识准备不足,所以常常出现这样或那样的错误,尤其对初二年级的新生来说,这方面的困难更大一些。为了很好地解决这个问题,我在长期的教学实践中摸索出用“乘积式法”解答比例题有效途径,并取得了良好的效果,下面通过举例作一简单介绍。例1 甲乙两物体的速度之比为2:3,通过的路程之比是5:7,那么它们所用时间之比
The topic of proportionality is one of the most common types of physics questions. It covers most of the chapters of thermals, mechanics, and electricity. Due to students’ poor preparation of knowledge in mathematics, this or that error often occurs. This is especially true for new students in the second grade. In order to solve this problem well, I have explored effective ways to solve proportional problems with the “product method” in long-term teaching practice, and achieved good results. The following is a brief introduction by way of example. The ratio of the speeds of the two objects in Example 1 and B is 2:3. The ratio of the distances passed is 5:7.