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众所周知,受力分析是力学中的一个重点,又是难点,对物体受力分析的正确与否,直接影响到解题的思路、方法与结果. 本文拟对常见的物体受三力平衡的情况进行归纳、分析. 一、物体受到的三力中有两外力互相垂直由于三力中有两个力互相垂直,根据力的合成的平行四边形定则,作出的平行四边形中,必有一个直角三角形,因此,计算较为便捷.
As we all know, force analysis is a key point in mechanics, but also difficult, the correct analysis of the force of the object directly affects the way to solve the problem, methods and results.This article intends to common objects subject to the balance of three forces First, the object by the three forces perpendicular to each other two vertical As the three forces in two perpendicular to each other, according to the force of the parallelogram of the synthesis of the law, made parallelogram, there must be a right-angled triangle Therefore, the calculation is more convenient.