功与功的要素一个力作用在物体上,物体在这个力的方向上移动了一段距离,我们就说力对这个物体做了功。也就是说,某个过程是否做功,要具备两个要素:一是有力作用在物体上,二是物体在力的方向上移动距离。二者缺一这个过程都没有做功。由此我们可以挖掘出如下三种不做功的情形:1.有力作用在物体上而物体没有在力的方向移动距离。如图1所示,运动 The elements of work and power exert one force on an object, and the object moves some distance in the direction of this force, and we say that we are doing something to this object. In other words, whether a process is doing work, we must have two elements: First, a strong role in the object, and second, the object moves in the direction of the force distance. Neither of them has done any work in this process. From this we can dig out the following three kinds of work situation: 1. A strong role in the object and the object does not move in the direction of the force. Shown in Figure 1, exercise