Smooth surfaces are tacky at small scales.
References
Budakian, R. & Putterman, S.J. Time scales for cold-welding and the origins of stick-slip behaviour. Preprint, (2001).
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Ball, P. Spot-welds stick sliding metals. Nature (2002). https://doi.org/10.1038/news020311-10
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DOI: https://doi.org/10.1038/news020311-10
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