刚体共面力系平衡条件的等效证明

The Equivalent Proof of Equilibrium Condition of Rigid Body Coplanar Force System

针对力学教材中研究刚体平衡问题所必需研究的平衡条件,分别考虑了平衡条件投影到1个参考点、2个参考点和3个参考点的坐标系的3种情形,证明了这3种情形下的平衡条件之间是相互等效的.

As for the equilibrium conditions of rigid body in the textbooks, this paper discusses three states, in which the equilibrium conditions are projected on to different reference points in the coordinate system. The equilibrium conditions in the three states are proved to be equivalent to each other.