来自《耶鲁大学开放课程：基础物理 第3集 第3集》
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So, Newton did not ever tell you牛顿从来也没有告诉过你 -
what the expression for force is in a given context.在这种情况下力的表达式 -
That is a constant study.这项研究花了很长时间 -
Coulomb discovered the Coulomb's law,后来库仑发现了库仑定律 -
which is a repulsion between charges.才知道这是电荷之间的排斥作用 -
Nowadays we know if you go into the neutron or the proton,如今我们知道 如果进入中子或者质子内部 -
there are quarks.就会发现夸克 -
There are forces between the quarks.在夸克之间存在力的作用 -
You can ask你会问 -
what the force that this quark will exert这个夸克对一段距离以外的那个夸克 -
on that quark at a certain separation.有多大的作用力 -
That was obviously not known to Newton.显然 牛顿不知道这个