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If I am an inertial observer, another person moving relative to me at constant velocity will also be an inertial observer.
如果我是惯性观察者,那另一个相对于我做匀速运动的人,也是一个惯性观察者
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One is inertial mass, which is how much you hate your velocity to change, how hard you resist acceleration.
一个是惯性质量,它反映了物体速度改变的难易程度,即保持加速度的难易程度
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There are a lot of ways in which a red light means neither "stop" nor "go," but we are sort of confining ourselves so far to the ways in which a red light has something to do with locomotion or the lack thereof.
很多时候红灯既不表示停,也不表示走“,但是我们却惯性的认为,红灯就是提示开始或者停止移动。
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But another possibility is once you do something it's kind of hard to stop.
但也有可能是因为,婴儿很难使自己的惯性动作停下来
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The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.
地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止
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If you're an inertial observer, then in your system of reference, objects left at rest will remain at rest.
如果你是惯性观察者,那么在你的参考系内,静止的物体会保持静止
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If I give you one observer for whom the Law of Inertia is true, I say that others for whom is also true.
如果知道一个人适用惯性定律,那肯定有其他一部分人也适用惯性定律
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if the Law of Inertia is valid for me, it's valid for other people in the same room at rest with respect to me.
如果惯性定律对我适用,那就对这屋子里的其他和我保持相对静止的人,也同样适用
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But if you go to outer space nowadays, you can find truly inertial frames of reference.
但如今,要是你到了外太空,你可以找到真正的惯性参考系
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But if you go on a plane which is accelerating, you're no longer inertial.
但如果你上了一架加速飞行的飞机,你就不再处于惯性状态了
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The point of Newton is, two things in the Law of Inertia, which one may think is trivial.
牛顿的观点是,惯性定律分两部分,可能有人觉得这种分法无关紧要
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There's infinite number of them, but they're all moving relative to each other at constant velocity.
有无数个惯性观察者,但是他们都在相对于彼此,做匀速运动
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That is an example of a person for whom the Law of Inertia does not work.
这就是一个惯性定律不成立的例子
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So the Earth is an inertial frame of reference, if you go in a train relative to the Earth at constant velocity, you're also inertial.
所以,地球是一个惯性参考系,如果你坐在相对于地球匀速运动的火车里,你也处于惯性状态
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All of them mean it's really not inertial, but it's approximately inertial.
这一切都意味着它不处于惯性状态,但它很接近惯性状态
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It's a useful concept on the Earth, because Earth is approximately inertial.
这种观点在地球上很有用,因为地球很接近惯性状态
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it's not that there's only one fortunate family of inertial observers.
并不是说只存在一种惯性观察者
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The point is that there are inertial frames of reference.
重点就是,惯性参考系是存在的
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You have to be what's called an "inertial observer."
你必须是"惯性观察者"才行
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If you find one inertial observer, namely one person for whom this Law of Inertia works, I can manufacture for you an infinite number of other people for whom this is true.
如果你能找到一个惯性观察者,也就是适用惯性定律的人,我就可以给你找到,很多其他的也适用惯性定律的人
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You must know the Earth is not precisely inertial.
你们都知道,地球不是严格意义上的惯性参考系
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It's called the Law of Inertia.
又名惯性定律
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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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