直面参照物

• 作 者: 华庆富
• 出 处: 中学生数理化(初中版)(中考版)
• 发表日期: 2012年Z2期
• 关键词: 参照物 运动情况 物体 地面 “风” 海平面 地平线 静止

一、参照物的选择在判断物体的机械运动情况时,我们要选择一个用来作对比的物体,这个物体叫做参照物.物体相对于参照物来说位置改变了,它就是运动的,位置没有改变它就是静止的.参照物的选择是根据需要定的,一般研究地面上的物体的运动情况,我们都是选择相对于地面静止的树木、建筑作为参照物.特别要注意的是,参照物是物体,像“天空”“地平线”“海平面”“风”都不

First, the choice of reference object In judging the mechanical movement of objects, we have to choose a comparative object, the object is called the reference object object relative to the position change, it is the movement, the position is not Change it is static. The choice of reference objects is set according to need, the general study of the movement of objects on the ground, we are all relative to the ground stationary trees, building as a reference .In particular note that the reference Is the object, like “sky ” “horizon ” “sea level ” “wind ” neither