Comment on "On the Origin of Frictional Energy Dissipation"

TL;DR

This paper critiques a study on atomic damping in a simplified model, emphasizing that real-world frictional energy dissipation involves more complex dynamics than the model suggests.

Contribution

It highlights the limitations of simplified models in accurately representing frictional energy dissipation in practical scenarios.

Findings

Simplified models may not capture the complexity of real frictional systems.

Surface atom damping can differ significantly in real materials.

The study emphasizes the need for more comprehensive models.

Abstract

In their interesting study (Ref. [1]) Hu et al have shown that for a simple "harmonium" solid model the slip-induced motion of surface atoms is close to critically damped. This result is in fact well known from studies of vibrational damping of atoms and molecules at surfaces. However, for real practical cases the situation may be much more complex and the conclusions of Hu et al invalid.