▍1. CompDam_DGD
摩擦力是抵抗固體表面,流體層和材料元件相對滑動的相對運動的力。有幾種類型的摩擦:幹摩擦是一種與之相反的力(friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the)