根据化繁为简的原则以及面构成体的关系,试想如果能将立体受力分析转化为平面受力分析,问题是不是也就轻松解决了呢?这就自然涉及了力的合成与分解。立体受力分析的技巧旨在于将立体转化为平面。而高中阶段绝大部分实例是处于斜面上的物体,即只研究沿着斜面的重力的分力,便可将立体受力分析转化为平面问题了。 According to the principle of simplification and the relationship between the surface structure, imagine if the three-dimensional force analysis can be transformed into the plane force analysis, the problem is not also easy to solve it? This naturally involves the synthesis and decomposition of force. The technique of three-dimensional stress analysis is to transform three-dimensional into a plane. In the high school, most of the examples are objects on the slope, that is, only studying the component of the gravity along the slope can transform the three-dimensional force analysis into a plane problem.