当物体处于平衡状态时,物体对水平支持物的压力FN(或对悬挂物的拉力)大小等于物体所受的重力G,此时FN=G.当物体具有向上的加速度a时,物体对水平支持物的压力(或对悬挂物的拉力)大于物体所受重力,称为超重现象,此时FN=G=ma,超出的部分为ma.当物体具有向下的加速度a时,物体对水平支持物的压 When the object is in equilibrium, the object’s pressure on the horizontal support FN (or the tension on the suspended object) is equal to the weight of the object G, FN = G. When the object has an upward acceleration a, the object on the level The pressure of the support (or the tension on the suspension) is greater than the weight of the object, which is called the overweight phenomenon. At this time, FN=G=ma, and the excess part is ma. When the object has a downward acceleration a, the level of the object is horizontal. Support pressure