我们知道,物体运动的性质是由其初速和受力的情况决定,因此分析物体的受力情况、画出物体的受力图是研究和解决问题中的一个很重要的环节.平时教学中通常所研究的力在同一平面内,这些力叫做共面力,如果所受各力不在同一个平面内,则叫做异面力.近年来,一些省市的高考物理试题开始出现了物体受异面力作用的问题,一些考生在考后反映:异面力的题目,平时做的少,做题不习惯,找 We know that the nature of the movement of an object is determined by its initial speed and force, so analyzing the force of the object and drawing the stress map of the object is a very important part of studying and solving the problem. The force studied in the same plane, these forces are called coplanar force, if the forces suffered are not in the same plane, then called the heterogeneous force.In recent years, a number of provinces and cities entrance exam physics began to appear the object by different surface Force role of the problem, some candidates reflect after the test: the problem of dissidents, usually do less, do not get used to the problem, to find