一、相似三角形法这是一种应用较为广泛的方法.具体应用时,先画出力的三角形,再寻找与力的三角形相似的空间三角形,由相似三角形建立比例关系求解.例1如图1所示,在半径为R的光滑半球面上高h处悬挂一定滑轮,重力为G的小球用绕过滑轮的绳子被站在地面上的人拉着.人拉动绳子,在小 First, similar to the triangle method This is a more widely used method. For specific applications, first draw the force of the triangle, and then find a similar space triangle with the force of the triangle, similar to the triangle to establish the proportional relationship solution. Example 1 as shown in Figure 1 Shows that on a smooth hemispherical surface with a radius of R, a certain pulley is hung at a high h, and a ball with a gravity of G is pulled by a person standing on the ground with a rope that bypasses the pulley. The person pulls the rope,