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He said, first, let it go a little distance, take the distance over time, that gives you the velocity now.
他说,首先,让它运动一小段距离,距离除以时间,你就能得到现在的速度
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I'm interested in sports. I'm an avid fan and I, you know, play when I have time.
我对体育非常着迷，是一个狂热的体育迷。我一有时间就去运动。
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One way to mark time is to imagine it carries a clock as it moves, and put markers every second.
标记时间的一种方法是,想像它带着时钟运动,并且每秒做一次标记
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No, I don't have enough time to exercise.
我一向来都不运动，因为我没有足够的时间。
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But Galileo already managed to find examples where things would roll on for a very, very long time.
但伽利略已经成功找到了,物体可以运动很长很长时间的例子
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You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.
你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动
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If that's all it knows, then in that scenario there is no building or anything else; it continues a trajectory both forward in time and backward in time, and it says that whatever seconds, one second before you set your clock to 0, it would've been on the ground.
如果是这样,在那种模式下,没有楼房或者别的什么,物体的运动轨迹可以沿时间可以向后延伸,也可以向前延伸,不管时间取什么值,在零点前一秒时,物体就在地面上
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Here, in one second, it seems to have gone much further, so it's probably traveling faster.
在这一秒内,它似乎运动了更远的距离,所以这段时间它可能运动得更快
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So, time is measured as a parameter along the motion of the particle.
这样,时间就被记为质点运动的一个参数
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You've got to ask yourself, let the time it takes to do a full circle, that's the time period, do a full circle.
你已经问你自己了,留足够的时间让它运动一整圈,那就是运动整个圆周的时间周期
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What that means is, if you know the velocity of the given time and you know the initial velocity, you know what time it is.
这个方程的意义是,如果你知道某个给定时刻的速度,并且知道初速度,你就能知道运动的时间
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I will draw the famous picture of some particle moving and it's here at t of some value of x.
我会画某个质点运动的,经典图像,这是某个x值对应的时间t
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So what I've said so far is, a particle moving in time from point to point can be represented by a graph, x versus t.
到目前为止,我说过,一个质点随时间的连续运动,可以用一幅x-t图来表示
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The time, in fact, is v-v0 over a.
实际上,运动时间为/a
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