HIGHLIGHTS
- What: The authors performed sliding experiments and measured but at the same time the authors also measured the real contact area with sub-micron lateral resolution which allowed the authors to design a two-parameter (Coulomb-type) equation. The primary reason was his awareness of another study where it was reported that a very large force was needed to separate lead balls if they were thoroughly cleaned compared with the non-cleaned balls. The authors compare these new results to the friction models of Amontons and Coulomb to better understand the actual differences between the one-parameter . . .
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