天平的横梁受到扰动后，能自动回到初始平衡位置的能力，称为稳定性。横梁是天平最重要的组成部分。横梁是一个单杠杆，其上装有三把刀子：位于中间的一把刀子作支点用，称为支点刀，亦称中刀；位于两端的两把刀子作承载荷用，称为重点刀，亦称边刀。 天平稳定性的理论部分这里 Balance beam is disturbed, the ability to automatically return to the initial equilibrium position, known as the stability. Beams are the most important part of the balance. Beam is a single lever, which is equipped with three knives: in the middle of a knife as a fulcrum, known as the fulcrum knife, also known as knives; at both ends of the two knives for bearing load, known as the key knife, also known as Side knife. The theoretical part of balance stability here