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在对物体进行受力分析时,为了形象地表示作用于物体上的力,经常需要作物体的受力分析图。一般地说能否正确地作出物体的受力图,是分析、解决问题的关键。因此,作受力图是物理力学教学中的基本训练,应当引起充分注意。所谓作受力图,就是要把所研究的物体——研究对象,单独拿出来进行受力分析。这种把研究对象和周围物体分隔开来的方法,称为隔离法。当我们把研究对象和周围物体“隔离”出来的时候,应当把那些物体作用在研究对象上的力画在研究对象上,即以力来表示别的物体对研究对象的作用。上述对研究对象的图示,叫做作研究对象的受力图。
In force analysis of an object, in order to visually represent the force acting on the object, a force analysis diagram of the crop body is often required. Generally speaking, whether or not the force diagram of an object can be correctly made is the key to analyzing and solving problems. Therefore, it is the basic training in the teaching of physical mechanics that should be paid attention to. The so-called task force is to put the object under study—the object of study—in a separate analysis. This method of separating research objects from surrounding objects is called isolation. When we “segregate” the research object from the surrounding objects, we should draw the force of those objects acting on the study object on the study object, that is, use force to express the effect of other objects on the research object. The above illustration of the research object is called the force diagram of the research object.