美国的兴衰不是不可抗拒力的作用。

The rise or decline of the United States is not a function of deterministic forces.

《柯林斯英汉双解大词典》

在这两种力的作用下，卫星不停地旋转。

With these two forces, the satellite goes round and round.

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我们知道，电场不过，是库仑力的作用空间。

We know what an electric field is, it's just a space through which a Coulomb force operates.

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That is, you minimize potential energy and you see things falling under the force of gravity and so forthgoing to potential energy minima in conformance with this result.

换句话说，你使得势能最小化,然后发现我们关注的东西,在重力或者其他力的作用下下落,直到势能最小的地方,这和我们刚才的结果是一致的。

麻省理工公开课 - 热力学与动力学课程节选

There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

麻省理工公开课 - 热力学与动力学课程节选

Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

耶鲁公开课 - 基础物理课程节选