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同学们,通过这一段时间的物理课学习,我们已初步认识到,学习物理既要重视物理现象、物理事实及有关概念的定性认识和理解,又要对一些物理量进行定量计算。而在定量计算中有关比值问题的计算,是一个难点,如何突破这一难点,值得我们研究和讨论,在这里我给同学们介绍一种有效的方法:例如甲乙两物体质量之比是2:1,甲的体积是乙体积的1/2,则甲乙两种物质密度之比为
Students, through this period of physics learning, we have initially realized that learning physics should not only pay attention to the qualitative understanding and understanding of physical phenomena, physical facts and related concepts, but also quantitatively calculate some physical quantities. The calculation of the ratio problem in quantitative calculation is a difficult point. How to overcome this difficulty is worthy of our research and discussion. Here I introduce to the students an effective method: For example, the ratio of the mass of the two objects is 2: 1, the volume of A is 1/2 of B, then the ratio of the density of A and B is