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要研究物体的运动情况,首先要选取参照物,那么如何选取参照物呢? 1.运动学中参照物的选取例1 某船以恒定的速度沿小河逆流而上,经过一小桥时从船上掉下一只救生圈,经过
To study the movement of an object, first select the reference object. Then how to select the reference object? 1. Selection of reference object in kinematics Example 1 A ship moves at a constant speed along a small river and goes through a small bridge. Drop a lifebuoy through