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放在水平桌面上的物体对桌面的压力N′是桌面对物体的支持力N的反作用力,它在数值上等于物体的重力mg。这个力容易被错认为是物体的重力。(图一)
The pressure on the table by the object placed on a horizontal table N 'is the counteraction of the table's supportive force N on the object, which is numerically equal to the object's gravity mg. This force is easily mistaken for the gravity of the object. (Figure 1)