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根据超重失重的定义,物体对支持物的压力(或对悬挂物的拉力)的大小叫视重。如图1,当放在升降机地板上的物体,有竖直向上(或竖直向下)的加速度时,根据牛顿第二定律得物体的视重 F=mg+ma(或 F=mg-ma),视重大于(小于)物体的实际重力,即发生超重(失重)现象。观察以上物体的视重,不难发现在超重(失重)现象中物体的视重,等于一个重力为 mg+ma (或 mg-ma)的物体处于平衡状态时的视重。由此可见,由竖直方向加速度导致的超重问题,可以等效为该物体重力增加(减少)ma 的平衡问题。在解题中适当应用超重失重的等
According to the definition of overweight loss, the pressure of the object on the support (or pull on the suspension) is called the weight. As shown in Figure 1, when an object placed on the lift floor has an upward vertical (or vertical downward) acceleration, the apparent weight of the object according to Newton’s second law is F = mg + ma (or F = mg-ma). ), depending on the actual gravity of the object (less than), that is, the occurrence of overweight (weightlessness) phenomenon. Observing the apparent weight of the above object, it is not difficult to find that the apparent weight of the object in the phenomenon of overweight (weightlessness) is equal to the apparent weight when an object whose gravitational force is mg+ma (or mg-ma) is in equilibrium. It can be seen that the problem of overweight caused by the acceleration in the vertical direction can be equivalent to the problem of the increase (decrease) ma of the gravity of the object. Appropriate application of weightless weight loss in problem solving