Everything I told you last time, you can summarize in these two equations.

上节课上我所讲的所有内容,可以总结为这两个方程

耶鲁公开课 - 基础物理课程节选

I'm just trying to solve out for the equation of this point.

我刚才就是为了解方程

耶鲁公开课 - 博弈论课程节选

This equation is telling you if you compress it, namely if x is negative, F will be then positive, because it's pushing you outwards.

这个方程告诉我们,如果压缩弹簧,即令 x 为负,F 就为正,因为推力的方向向外

耶鲁公开课 - 基础物理课程节选