平衡问题是高中物理的重点也是难点.要正确处理此类问题,关键是掌握其解题方法,现总结如下:一、力的合成法物体在三个共点力的作用下处于平衡状态,则任意两个力的合力一定与第三个力大小相等,方向相反;“力的合成法”是解决三力平衡问题的基本方法.例1 如图1甲所示,重物的质量为 m,轻细绳 AO 与 The balance issue is the focus and difficulty of high school physics. The key to correctly handling such issues is to grasp the methods for solving the problems. The summary is as follows: 1. The force synthesis method is in equilibrium under the action of three common forces. The resultant force of any two forces must be equal to the third force and in the opposite direction. The “force synthesis method” is the basic method to solve the three-force balance problem. Example 1 As shown in Figure 1A, the mass of the weight is m, light rope AO and