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(一)运动与静止的确定——身临其境观动静物体的动与静,是相对于所选取参照物而定。当我们选定了一参照物后,如何去判断物体相对于参照物的运动情况呢?这是我们初学物理时感到比较困难的一个问题。你不妨假想:你已设身处境地站在参照物上,这时你和参照物都是不动的。你此时观察到的物体的运动情况,就是物体相对于参照物的运动情况,这就是“身临其境观动静”。
(a) the determination of movement and rest - the immersive movements and stillness of the still life are determined relative to the selected reference. When we have selected a reference object, how can we determine the movement of the object relative to the reference? This is a problem that we find difficult when learning physics. You may wish to imagine that you have been standing on the reference in a situation where you and the reference are not moving. The movement of the object you observe at this time is the movement of the object relative to the reference object. This is “being in the context of its movement”.