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对物体进行正确的受力分析,是解决力学问题的前提和关键.如何做好物体的受力分析呢?同学们必须抓住以下4点.1明确对象选择研究对象是受力分析的首要环节.明确对象就是要弄清需要对哪个物体进行受力分析.具体分析时,我们只考虑别的物体对研究对象的作用,而不考虑研究对象对其他物体的作用.不能把研究对象受到的作用力与该对象对其他物体的反作用力相混淆.如:放在桌面的物体受到的是桌面的支持力,而不能把它对桌面的压力看成是物体所受的力.
The correct force analysis of the object is the premise and key to solve the mechanical problem. How to do a good analysis of the object? The students must grasp the following four points. 1. Clear object selection The object of study is the most important part of force analysis. A clear object is to find out which object needs to be subjected to force analysis. In the specific analysis, we only consider the effect of other objects on the research object, and do not consider the effect of the research object on other objects. The role of the study object cannot be affected. The force is confused with the object’s reaction to other objects. For example, the object placed on the desktop is supported by the desktop, and the pressure on the desktop cannot be regarded as the force on the object.