转动主动齿轮若干圈以校正轴承滚柱。
Rotate the pinion gear several complete revolutions to align the bearing rollers.
这是与z正轴的夹角。
方向为x正轴方向,在碰撞前,它有一定动量。
Let this be the direction of increasing x, and so before the collision I have a certain amount of momentum.
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
j points away from the origin in the y direction.
从原点指向 y 轴正方向
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