Now, how do we get this unit vector?

那我们怎么得到这单位矢量呢？

youdao

OK, so if I give you a unit vector, you can ask yourself, if I move in the direction, how quickly will my function change?

也就是，如果我给你一个单位向量，试问，我沿着这个方向移动，我的函数值会变化得多快呢？

youdao

Now, another useful notion is the unit vector to the trajectory.

还有一个有用的概念就是轨道的单位矢量。

youdao

If you do, the unit vectors are called i prime and j prime, the components of the vector change.

如果这么做,单位矢量就是 i' 和 j',矢量的两个分量也会发生变化

耶鲁公开课 - 基础物理课程节选

Here is the unit vector i prime, that's unit vector j prime and here is this vector A.

这是单位矢量 i',那是单位矢量 j',以及这是矢量 A

耶鲁公开课 - 基础物理课程节选

Unit vector i points away from the origin in the x direction.

单位矢量 i 从原点指向 x 轴正方向

耶鲁公开课 - 基础物理课程节选

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