⑥简单的运动[知识回顾]一、机械运动1郾物理学里把物体的变化叫做机械运动.在描述物体运动情况的时候,被选作标准的物体,叫做郾物体在一条直线上运动,如果快慢不变,那么这种运动叫做运动郾2郾物体运动还是静止,是相对于参照物而言的,这就是运动和静止的郾3郾最简单的机械运动 6 Simple movements [knowledge review] 1. Mechanical movement 1. In physics, the change of an object is called a mechanical movement. When describing the movement of an object, an object that is selected as a standard is called a skeleton object and moves in a straight line. The speed is the same, then this kind of movement is called the movement 郾 2 郾 object movement or stillness, is relative to the reference object, this is the movement and the static 郾 3 郾 the simplest mechanical movement