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很多物理规律或公式都有一定的使用范围和使用条件,当公式的使用条件不严格时,不能使用该公式进行定量计算,但可以进行定性分析,我们可以称之为“定量关系的定性应用”.以功的公式W=FS为例,该公式只适用于恒力,当力不恒定时当然不能根据此公式来计算功的大小,但可以根据此公式来比较功的大小,也就是将定量关系推广到定性的情境中.
Many physical laws or formulas have a certain range of use and conditions of use. When the conditions of use of the formula are not strict, the formula cannot be used for quantitative calculations, but qualitative analysis can be performed. We can call it a qualitative application of quantitative relations. ". Take the formula of work W=FS as an example. This formula is only applicable to constant force. When the force is not constant, of course, the size of work can not be calculated according to this formula, but the size of the work can be compared according to this formula, that is, The quantitative relationship is extended to qualitative contexts.