And so I could now make a plot x whereby I could have here x F and I could have here this force F, which I know because I know the masses.

现在我可以,画一张图,这里是,这是力，这个力我们知道,因为它就是重物质量。

youdao

F And we're going to pull on this here with force f.

我要用力，拉这里。

youdao

So therefore the earth will experience - this same force, f-- 5 newton, in this direction.

地球受到,与F一样大的力-,5N，方向相反。

youdao

The F-35 will be used by the U.S.Air Force and also by the Navy to fly off of aircraft carriers.

VOA: standard.2009.07.21

It will typically look like this and the formula we say is F = - kx, where k is called "The force constant."

图像看上去一般就像这样,对应的式子是 F = - kx,k 叫做"弹性系数"

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VOA: standard.2009.11.15

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