All of the strikes have occurred in areas where Pakistan's military exerts little,if any control.

VOA: standard.2009.03.19

I draw a graph here of the amount by which I pull the spring versus the force it exerts.

我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小

耶鲁公开课 - 基础物理课程节选

It's a positive force, and it exerts an actual and somehow palpable, discernible force in the world.

它是一种积极的力量，它在世界上发挥一种实际的，某种可感知可识别的作用。

耶鲁公开课 - 弥尔顿课程节选

If you assume that, you are not playing by the rule, we don't know what force it exerts.

如果你假定了,那你就犯规了,我们不知道它施加了多大的力

耶鲁公开课 - 基础物理课程节选

It is of opposite charge and it exerts an influence, only that is minus to plus so that is going to give me a minus term here.

它具有相反的电性，所以它也会有影响，只有这个负值相对正值来说会起到减少的作用,所以这里将会引入一个负值的量。

麻省理工公开课 - 固态化学导论课程节选

Now I can measure that, because I pull it by one centimeter and I find the acceleration it exerts on a known mass.

现在就能测量这个力了,因为把弹簧拉伸 1 厘米,我就知道它让一个质量已知的物体产生的加速度

耶鲁公开课 - 基础物理课程节选

We want to know how much force it exerts when I pull it by a certain amount.

我们想知道当我们将弹簧拉伸一定量时,它能产生多大的力

耶鲁公开课 - 基础物理课程节选

First, we got to make sure the spring exerts a fixed force every time.

首先,要保证,弹簧每次产生的力是恒定的

耶鲁公开课 - 基础物理课程节选

We do know it exerts a force, so here's what you do.

我们只知道它施加了一个力,所以你应该这么做

耶鲁公开课 - 基础物理课程节选

We don't know what force it exerts.

我们不知道它会产生多大的力

耶鲁公开课 - 基础物理课程节选

But it exerts some force.

但确实产生了某种力

耶鲁公开课 - 基础物理课程节选

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

耶鲁公开课 - 基础物理课程节选