I lighted my lantern, and found that I was perched on a narrow ledge, almost at the end of my rope literally and figuratively.

VOA: special.2009.12.07

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

耶鲁公开课 - 基础物理课程节选

So, massless bodies will always have, like a massless rope, equal and opposite forces on the two ends.

所以无质量的物体,比如这个绳子,两边所受的力永远都相等

耶鲁公开课 - 基础物理课程节选

We run a tight rope daily, balancing a pile of books on the head.

VOA: special.2009.06.28

Whenever you're asked on a problem, "What's the tension on the rope?"

不管什么题目问你,"绳子的张力是多少"

耶鲁公开课 - 基础物理课程节选

"Hats,scarves, we've got playing cards, soap on a rope,things like that."

VOA: standard.2010.07.10

So, tension on the rope is 6 Newtons.

所以绳子的张力是 6 牛

耶鲁公开课 - 基础物理课程节选

That is called the tension on the rope.

那就是绳子的张力

耶鲁公开课 - 基础物理课程节选

kg is being pulled by the rope on the right with a force that I'm going to call T, which stands for tension.

千克的物体受到绳子向右的一个拉力,我称它为 T,也就是拉力的意思

耶鲁公开课 - 基础物理课程节选