I know that if the second mass moved faster than the first one, then the picture is completely wrong.

因为我知道如果第二个物体比第一个运动更快,那么受力图就肯定不是这样了

耶鲁公开课 - 基础物理课程节选

First is the body mass index, you're going to see this a lot and you--some of you probably know about it already because it's out there in the popular literature.

首先是体重指数,我们会经常碰到这个概念,你们也许已经知道这个概念了,它经常在科普读物中出现

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

We'll first pick the body, with mass 3.

我们先来分析这个 3 千克的物体

耶鲁公开课 - 基础物理课程节选

So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.

让我们继续定义这些常数,我们对这些应该都很熟悉了，首先，我们有质量，m等于。

麻省理工公开课 - 化学原理课程节选

For example, how do I know that when I pull the spring the first time for the mass, it exerted the same force when I pulled the spring the second time for the elephant?

例如 怎样才能知道,第一次连着物体拉弹簧时,产生的力和,第二次连着大象拉弹簧时产生的力是相等的呢

耶鲁公开课 - 基础物理课程节选