Newton says F = ma, so to make it a useful result of this problem, we know the mass of this guy.

牛顿指出 F = ma,这对于解决这个问题很有用,我们知道这个物体的质量

耶鲁公开课 - 基础物理课程节选

It's like joining the army at eighteen; at twenty-four, that's what you do if you have an MA from Cambridge.

你18岁就该入伍，24岁，的剑桥硕士毕业生就该。

耶鲁公开课 - 弥尔顿课程节选

He was a hobo by choice: As a little boy, he'd seen a hobo come up to ask his mother for a piece of pie and she had given it to him and when the hobo went off down the road the little boy had said, "Ma, what was that fellow?" "Why, that's a hobo."

他是自愿成为流浪汉的：,当他还是个小男孩的时候，他见过一个流浪汉向他妈妈,要一块派，他妈妈给他了,于是当流浪汉离开的时候小男孩就问，“妈妈，那个家伙是谁“，“是个流浪汉“

耶鲁公开课 - 1945年后的美国小说课程节选

So here's our potential equilibrium with just Beatrice standing, and if somebody to the, which way do we do it, somebody to the right of Beatrice was to stand, so ma'am if you stand a second, and your name is?

只有比阿特丽斯参选是潜在的均衡,如果有人,我们从哪个方向演示好呢,比阿特丽斯右边的某个人参选,这位女士请站起来一下,你的名字是

耶鲁公开课 - 博弈论课程节选

F = ma is universally true, independent of the nature of the force acting on a body.

= ma 是一条普适定律,与作用在物体上的力的属性无关

耶鲁公开课 - 基础物理课程节选

When I was not accelerating and everything was at rest, ma was 0, w was mg, and w was the reading on the needle.

当我还没有加速,一切静止的时候,ma 是 0,w 就等于 mg,w 就是指针的读数

耶鲁公开课 - 基础物理课程节选

F=ma. The a is this fellow here, and nothing else is given an independent name.

=ma,a就是这里的这个,其它的都没有独立命名

耶鲁公开课 - 基础物理课程节选

Now, you can do F = ma for the three different objects.

现在你可以用 F = ma 对这三个物体进行计算

耶鲁公开课 - 基础物理课程节选

What's the difference between saying F = -kx and F = ma?

= -kx 与 F = ma 的区别在哪里

耶鲁公开课 - 基础物理课程节选

The free-body diagram, it says you can pick any one body that you like and apply F = ma to it, provided you identify all the forces acting on that body.

所谓隔离法,就是说你可以任意 选取一个物体,分析出它所受的所有力后,单独对其运用 F = ma 进行计算

耶鲁公开课 - 基础物理课程节选