1.
Phys Rev E Stat Nonlin Soft Matter Phys
; 79(2 Pt 1): 022301, 2009 Feb.
Artículo
en Inglés
| MEDLINE
| ID: mdl-19391789
RESUMEN
We present experimental results for the rolling of spheres on a granular bed. We use two sets of glass and steel spheres with varying diameters and a high-speed camera to follow the motion of the spheres. Despite the complex phenomena occurring during the rolling, the results show a friction coefficient nearly independent of the velocity (0.45-0.5 for glass and 0.6-0.65 for steel). It is found that for a given sphere density, the large spheres reach a longer distance, a result that may also help explain the rock sorting along natural stone accumulations at the foot of mountain slopes.