So, we just talked about the force law to describe the interaction between a proton and an electron. You told me that when the distance went to infinity, the force went to zero.

我们刚刚讨论了描述质子，和电子之间相互作用力的定律，当距离变为无穷时，力变为零，那当距离变为，零时会发生什么？

youdao

Only now is there no acceleration so I can write down that force of Walter Lewin plus the force of gravity equals zero.

加速度才为零,写出来就是：我给它的力,与重力之合力等于零。

youdao

And if the curl is zero then it means that this force does not generate any rotation effects.

如果旋度是0，就意味着，这个力不产生旋转作用。

youdao

That force is scheduled to be reduced from nearly by next October,and to zero by the end of 2011, although Secretary Gates said Friday there could be a follow-on agreement for some U.S.troops to stay, particularly elements of the Air Force.

VOA: standard.2009.12.12

And now the force, in its most general term / is q1q2 over 4 pi epsilon zero, which is the conversion factor r squared.

库仑力的最基本形式,就是，其中r是一个变量。

麻省理工公开课 - 固态化学导论课程节选

So what am I saying? The net force is zero.

为什么要怎么说，因为合力为。

麻省理工公开课 - 固态化学导论课程节选

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With zero grams of activation force, Crescendo Sensor works at all angles and requires absolutely no calibration, providing hundreds of levels of pressure.

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