The process of surface degradation and material removal due to adhesive force between
rubbing surfaces (ie, adhesive wear) involves an apparent contradiction. The material …

The sliding friction of rock, involving all kinds of particles at the contact surface, is relevant to
many problems, ranging from those in artificial engineering to earthquake dynamics. In this …

For millennia, human‐made machinery incorporated rolls and wheels to reduce frictional
resistance, yet similar elements are practically absent in natural systems. We found in rock …