Finally, the total friction force of the PSS is measured.

最后，对系统的摩擦力进行了测试。

youdao

By friction is meant a force opposing motion.

摩擦力指的是阻碍运动的一种力。

youdao

This force, which we call friction, always opposes motion.

这种总是阻碍运动的力我们称之为摩擦力。

youdao

This force, which we call friction, always opposes motion.

这种总是阻碍运动的力我们称之为摩擦力。

youdao