The amount of force needed is inversely proportional to the rigidity of the material.

需要的力度与材料的硬度成反比。

youdao

If I make the spring twice as long, I would get double the extension, because when I have two springs in series, each one, under the influence of this force, will get longer by this amount.

若弹簧长度加倍，拉长刚才的两倍，当我把两个弹簧串联，任何一个弹簧，在这个力的作用下，将会拉长相同的量。

youdao

Until the 18th century mankind's output had been restricted by the amount of physical force that humans (and domesticated animals) could exert and by the amount of wood that people could chop down.

直至18世纪前，人类的产出仍受制于人(及家畜)的体力以及砍伐树木的数量。

youdao

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

Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

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

Second, they are indeed attempting to force a small amount of inflation to occur.

FORBES: Why The Monetary Stimulus Didn't Work

Adding what amounts to a ban on e-cigarettes will tie the hands of millions of EU smokers desperate to quit, and force a like amount of successful quitters back on to lethal addictive cigarettes.

FORBES: The EU's New Tobacco Directive: Protecting Cigarette Markets, Killing Smokers

"The appropriate amount of force was used for the situation, " said Navy Rear Adm.

WSJ: US military defends Guantanamo prison raid