In daily life, everything seems to come to rest unless you push it or you pull it or you exert some kind of force.

在日常生活中,一切物体都会停下来,除非你去推它,或者拉它,或者施加某种外力

耶鲁公开课 - 基础物理课程节选

That's the force you're using to push down.

这就是压缩功。

麻省理工公开课 - 热力学与动力学课程节选