机械运动就是一个物体相对于另一个物体位置的改变.也就是说一个物体是否运动、怎样运动,取决于这个物体与被选做标准的另一个物体间的位置是否变化、怎样变化.而那一个被选做标准的物体即为参照物.初中物理一般研究以下几种情况的机械 Mechanical movement is the change of an object relative to another object, that is to say, whether an object moves or not depends on whether or not the position of the object changes from that of another object selected as a standard. Selected as the standard object is the reference object. General junior high school physics following several cases of machinery