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？
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。
There is another thing that we know because if a force derives from a potential 0 then that means its curl is zero Thats the criterion we have seen for a vector field to derive from a potential.
我们还知道,如果力是由势产生的,那么其旋度是,这就是我们得到的,关于从势产生的向量场的准则。
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。
And so one string must be pulling in this direction and the other string must be pulling in this direction so that the net force on the system is zero.
因此一条细绳施加一个拉力，朝这个方向，另一条细绳也必然施加拉力，朝这个方向，这样整个整体合力为零。
That means the force on it must be zero.
也就是说它受合力为零。
There is a catch, however. Supplying trillions of dollars of reserves and driving interest rates to zero cannot force banks to lend or companies and households to borrow.
有一个难题就是，提供再多储备，利率降得再低，也不能强制银行、公司和个人进行借贷。
合力为零的话。
And the frictional force, in this case will adjust itself just the right way so that Newton's Second Law in the x direction will give you, for the force, a zero.
其它情况下，摩擦力会根据情况调节自身,此时在x方向上使用第二定律,合力为0就是结果。
I've been running development boxes with the Xdmx software "force-installed" with zero errors for more than a year, but your experience may differ.
我曾经没有一点儿错误地运行使用 “强制安装的”Xdmx软件的开发环境有一年多时间，但是您的体验可能会不同。
If I look at this result — the sum of gravitational potential energy and kinetic energy is conserved - for gravitational force — then it is immediately obvious where we put the zero of kinetic energy.
如果看这个结果-，重力势能与动能之和，在重力作用下，是守恒的-，马上，很明显的发现，动能为0的地方。
The momentum of the cluster as a whole would not change if there are no external forces on the system, 0 if the net sum, the total external force, is zero.
星云的动量,作为整体是不变的,若无外力作用于系统，如果外力总和为。
that if the external force, 0 the total external force on the whole system is zero, it means that the momentum cannot change.
,如果外力，作用于系统的外力为，意味着动量没改变。
To have an interference or force fit between mating parts, the tolerances must be such as to create a zero or negative allowance.
为了使配合零件之间具有过盈或强制配合，公差必须产生零或负允差。
On the equator the deflection force of earth rotation which acts on the objects in non horizontal motion is not equal to zero.
赤道上作非水平面内运动的物体所受的地转偏向力并不等于零。
In other words zero resultant force is equivalent to no force at all.
换句话说，合力为零就相当于没有任何力的作用。
Data showed that for every 100 miles on the road, elevated g-force events ranged from near zero for some drivers to as high as 50 for others.
数据显示，公路上每隔100英里，某些司机重力加速度事件出现的的次数近乎于零，而其他某些司机则高达50次。
In other words, the vertical component of its linear momentum remains zero, since there is no resultant vertical force.
换句话说，因为没有竖直方向的合力，所以线动量的竖直方向仍为零。
Pressure Angle is never zero, the transmitted force always tends to push centers of the gear apart.
压力角不会是零，传动力总是倾向于把齿轮的中心分开。
The precise critical force of a system can be deduced from the fact that the determinant of stiffness matrix of the system is equal to zero in the critical condition.
由结构刚度矩阵行列式值为零的失稳条件导出结构失稳特征方程，从而精确地确定系统临界力值。
If the force P is reduced or made zero, the elastic force will restore the spring to its original unstretched condition.
如果力P减小或变为零，那么弹性力就使弹簧恢复当初的未伸长状态。
The tangency point of Bottom Hole Assembly is located at where the drill string just touches the wall of the borehole, and the contact force is zero here.
在计算底部钻具组合的受力和变形时，以前一般都是按弯矩为零的条件来确定其上切点的位置。
The centrifugal force caused by the earth's rotation decreases from a maximum at the equator to zero at the poles.
地球自转产生的离心力从赤道的最大值降低到极地的零值。
The utility model provides a multi-functional neutral pen which can fluently write under the zero gravity state or when the gravity does not point to the component force of a pen point.
本实用新型提供一种多功能中性笔，使其在失重状态或重力无指向笔尖分力时也可流利书写。
The utility model provides a multi-functional neutral pen which can fluently write under the zero gravity state or when the gravity does not point to the component force of a pen point.
本实用新型提供一种多功能中性笔，使其在失重状态或重力无指向笔尖分力时也可流利书写。
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