不少学生在考试和比赛中因对物体的受力分析不正确而失分.但是,学生对受力分析是否正确的检查最感困难,许多学生在检查时,又沿着分析受力时的思路,因而不能检查出错误.这里介绍两条检查物体受力分析是否正确的原则.这两条原则是:一、每个力都应该能够找到施力物体.二、物体的受力情况应与题中物体的运动状态相符合. Many students lose points in the examinations and competitions due to incorrect analysis of the objects. However, it is most difficult for the students to check the correctness of the force analysis. Many students are checking the time and analyzing the stress. Therefore, we can’t check out the mistakes. Here are two principles for checking whether the stress analysis of the object is correct. The two principles are: First, each force should be able to find the force object. Second, the force condition of the object should be The object’s motion state matches.