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We have investigated the time evolution of sliding friction between colloidal spheres of PMMA (with diameters of 3 μm and 9.6 μm) supported by an AFM cantilever and a SiO2 grating consisting of alternated slopes of ± 55° and flat areas, and periodicity comparable or below the sphere diameters. With the larger sphere we recognize a reproducible ‘reverse stick-slip’, which is explained by mere momentum...
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