You apply a force and the material will resist it until you have a force great enough to break the bonds.

如何你对它施加一个外力，材料能够承受,除非这个外力足够强大去打破键。

麻省理工公开课 - 固态化学导论课程节选

And bathing inside the inner ear fluids where they become stimulated by sound waves and acceleration forces.

毛细胞悬浮在内耳液中,接受声波和其它外力的刺激。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

In daily life, everything seems to come to rest unless you push it or you pull it or you exert some kind of force.

在日常生活中,一切物体都会停下来,除非你去推它,或者拉它,或者施加某种外力

耶鲁公开课 - 基础物理课程节选

Whereas, ceramics, ionic crystals will resist until they shatter.

但是，陶瓷，离子晶体就会抵抗外力，只到它们破碎。

麻省理工公开课 - 固态化学导论课程节选

And fairly soon into the conversation I demonstrated some principle that you've probably learned in your physics class having to do with an object at rest remaining at rest unless acted upon by a force.

很快，在交谈中,我就展示了一些原理,可能你们在物理课上学过,要使静止的物体保持静止,必须有外力作用。

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That's another way of saying maintaining velocity if it's not acted upon by a force.

这就是不受外力作用时,速度保持不变的另一种说法

耶鲁公开课 - 基础物理课程节选

Strong bonds means the material will resist and applied force.

强键意味着,材料能够承受外力。

麻省理工公开课 - 固态化学导论课程节选

First, free velocity, constant velocity can be obtained for free without doing anything.

首先,速度是无偿的,恒定速度不需外力作用就能无偿获得

耶鲁公开课 - 基础物理课程节选

If you leave the body alone, maybe there's no force acting on it.

如果你把物体丢在一边,可能就没有外力作用在它上面

耶鲁公开课 - 基础物理课程节选

Then you find that you have to apply minimum force.

你就会发现,所需外力有最小值

耶鲁公开课 - 基础物理课程节选

The summary is that constant velocity doesn't require anything.

概括起来就是,匀速运动并不需要任何外力

耶鲁公开课 - 基础物理课程节选

But if you don't do anything, things stay.

如果不施加外力,物体保持静止

耶鲁公开课 - 基础物理课程节选

They don't need your help to do that.

不需要任何外力作用

耶鲁公开课 - 基础物理课程节选

The Law of Inertia says that, "If a body has no forces acting on it, then it will remain at rest if it was at rest to begin with, or if it had a velocity to begin with, it will maintain that velocity."

惯性定律就是,"如果一个物体不受外力作用,那么静止的物体依然保持静止,如果物体有个初速度,那么就保持此速度不变"

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What makes the law surprising is that if I only gave you half the law, namely every body will remain at rest if it's not acted upon by a force, you will say, "That's fine. I accept that, because here's something, you leave it there, it doesn't move.

这条定律妙就妙在,如果只看定律的前半段,即,如果物体不受外力作用,将保持静止状态,你肯定会觉得,"这没什么,我能理解,因为你把一个物体放在那里,自己肯定不会动

耶鲁公开课 - 基础物理课程节选

But then you can trace it to some external forces, which are carrying your iPod.

过一会儿你就能发现一些外力的作用,也就是有人把你的 iPod 拿走了

耶鲁公开课 - 基础物理课程节选