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But the acceleration it produces on the elephant and on the mass, are in an inverse ratio of their masses.
但这个力使大象和物体产生的加速度,与它们的质量成反比
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Therefore, when you divide by the mass to get the acceleration, the response of different bodies is inverse to the mass.
因此,当你拿力除以质量得到加速度时,不同物体的加速度与质量成反比
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The reason is because the predominant force at this point is going to be the attraction that's being felt between the nuclei and the electrons in each of the atoms.
这是因为这时候最主要的力,是吸引力，它来自于,其中一个原子的电子与另外一个原子的原子核之间。
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These are huge energies, Coulombic forces, high melting points and boiling points.
这里有巨大的能量，库仑力，高熔点与高沸点。
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He replied, "Jacob." Said he, "Your name shall no longer be Jacob, but Israel, for you have striven with God and men, and have prevailed." Jacob asked, "Pray tell me your name." But he said, "You must not ask my name!"
答，“我名叫雅各，“那人说，“你的名不要再叫雅各,要叫以色列，因为你与神与人较力都得了胜，“雅各问,“请将你的名告诉我，“那人却说，“何必问我的名，“
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To know history, put on the god's knowledge with his power, would be to have access to history's meaning, and therefore to be more than merely subject to it, subject to its capricious and violating forces.
懂得历史，把上帝之智与力结合，才能接近历史的真实意义，否则只是受过历史的影响而已，被动无力地承受着历史的影响。
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So, remember when we talk about Coulomb force, what's holding the nucleus and the electron together, there's 2 things we need to think about.
还记得我们在讨论库仑力的时候，提到是什么将原子核与电子束缚在一起时，有两点需要考虑。
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The force is not known, but it's the same force.
力的大小未知,但与前一个力大小相等
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That's how by either balancing the unknown force with a known force or by simply measuring the acceleration as I fall towards this podium and multiplying by mass, you can find the force that exerts on me.
我们既可以让未知力与已知力平衡,也可以只测量我冲向讲台时加速度的大小,再与我的质量相乘,都能求出作用在我身上的力的大小
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F = ma is universally true, independent of the nature of the force acting on a body.
= ma 是一条普适定律,与作用在物体上的力的属性无关
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That m times a is the force the spring is exerting.
与 a 的乘积就等于弹簧产生的力
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