论静力学的两种理论体系

Two Theoreticl Systems of Statics

在动力学创立之前和初创时期 ,不可能由力对物体的运动效应来研究力 ,静力学发展了独立的纯数学的体系。它有自己的公理。在这个体系中 ,力系简化是关键 ,简化为一个力和一个力偶。这个体系没有主矢主矩 ,缺乏物理意义。动力学发展以后 ,由力的运动效应来研究力 ,静力学有了建立在动力学基础之上的新体系。它以力系的作用量主矢主矩为提挈全部静力学理论的总纲 ,理论简练 ,顺畅 ,物理意义清晰。

Before the founding of dynamics and during its initial stage,it was impossible to study a force by the motion effect of a force on object.Statics developed independent pure mathematical system,which had its own axioms.The key in this system lies in simplifying it into a force and a couple.There are no principal vector and principal moment in the system.It is labourious and lacks physical meaning.After dynamics was developed,a force was studied by its motion effeet,statics has its new system based on dynamics.The principal vector and principal moment are the effect of a force system.They guided the whole statics theory system,which makes it simply,fluent and clear in physical meaning.