frictional
adj. [力] 摩擦的；由摩擦而生的
例句
The harder rocks push against each other, the hotter they become; in other words, pressure itself, not only the rocks' properties, affects frictional heating.
岩石相互推挤得越厉害，它们就会变得越热；换句话说，不仅是岩石的性质，压力本身也影响摩擦加热。
So there is also a frictional force.
所以这个是摩擦力。
How does the frictional force do that?
摩擦力是怎么做的？
