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众所周知,在中学物理所涉及的诸多图象中,有相当一部分的图象,它的图线和坐标轴所包围的面积,是有确定的物理意义的。比如,图1所示的速度—时间图象中阴影部分的面积值,表示的是运动物体在0～3秒内的位移值。又如图2所示的是力的位移函数图象中的阴影部分的面积值,表示为5牛的作用力使物体在力的方向上发生10米位移的过程中所做功的量值。
As we all know, in the many images involved in middle school physics, there is a considerable part of the image, and the area surrounded by its graph line and coordinate axes is of definite physical significance. For example, the area value of the shaded part in the speed-time image shown in FIG. 1 indicates the displacement value of the moving object within 0 to 3 seconds. Also shown in Fig. 2 is the area value of the shaded part in the force displacement function image, which is expressed as the amount of work done by a force of 5 N, which causes the object to undergo a displacement of 10 meters in the direction of the force.