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在初中物理中,关于机械运动的内容学生感到难以下手的是:给定一个物体的运动情况,要求判断此物体有这种运动情况所选的参照物;或者给出几个物体的相关运动情况,要求判断这些物体以另一物体为参照物的运动情况。本文以寓言“刻舟求剑”引出机械运动中选择参照物的重要性,并给出了用“物体相对位置变化情况”来“求解”参照物或判断物体运动情况的方法。
In junior high school physics, what students find hard to do with the content of a mechanical movement is that given the movement of an object, it is required to judge whether the object has the reference selected for such movement, or to give the relative movement of several objects , Asking to determine the movement of these objects to another object as a reference object. In this paper, we use the allegory “engraving a sword” to draw the importance of choosing a reference object in a mechanical movement and give a method of using the “relative position change” to “reference” or determine the object’s movement.