一个重6N的物体压在斜面上静止不动,它对斜面的压力为4N,作出物体的重力和斜面所受的压力的图示(图1)。同学们答题时出现了两种情况,一种是将压力的作用点画在斜面上,如图2所示;另一种则是将压力的作用点画在物体的重心上,如图3所示。 A 6N object is pressed against the inclined plane, and its pressure on the inclined plane is 4N, which shows the gravity of the object and the pressure on the inclined surface (Figure 1). There are two situations when the students answer, one is to draw the pressure on the slope, as shown in Figure 2. The other is to draw the pressure on the center of gravity of the object, as shown in Figure 3.