在物体的平衡中,常遇到三力作用下的平衡问题·本文所要介绍的就是三力平衡问题的处理方法·一、分解法例1图1中重物的质量为m,轻细绳AO、BO的A、B端是固定的·平衡时AO是水平的,BO与水平面的夹角为θ·AO的拉力F1和BO的拉力F2的大小是()(A)F1=mgcosθ(B)F1=mgcotθ(C)F2=mgsin In the balance of the object, we often encounter the balance problem under the action of the three forces. This article will introduce the treatment of the three-force balance problem. First, the weight of the weight in Figure 1 is m, and the light rope AO, The A and B ends of the BO are fixed. AO is horizontal when balanced. The angle between the BO and the horizontal plane is the tension F1 of the θ.AO and the magnitude of the tension F2 of the BO. ()(A)F1=mgcosθ(B)F1 =mgcotθ(C)F2=mgsin