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物理学中许多物理量都是用比值定义的,如场强 E=F/q,电阻 R=U/I,加速度 a=(Δv)/(Δt)等,为什么都这样定义?原来,这种定义方法蕴含着丰富的物理思想,下面以场强 E 的定义为例,说明这些思想.1.描述的思想人们对物质世界的认识,有一个信念,就是世界是可以认识的,而且需要用一些特殊的语言(物理概念和物理量)来描述物质世界的状态和性质.如电场这种物质,虽然看不到,摸不着,很神秘,其实它也是可以认识和能够描
Many physical quantities in physics are defined by ratios such as field strength E=F/q, resistance R=U/I, acceleration a=(Δv)/(Δt), etc., why are they so defined? Originally, this definition The method contains a wealth of physical ideas. The following uses the definition of the field strength E as an example to illustrate these ideas. 1. The ideological people described have a belief in the material world that there is a belief that the world can recognize and use some special The language (physical concept and physical quantity) is used to describe the state and nature of the material world. If the substance such as the electric field is invisible, intangible, and mysterious, it is also understandable and able to describe