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The penetration by a gravity driven impact of a solid sphere into a granularmedium is studied by two-dimensional simulations. The scaling laws observedexperimentally for both the final penetration depth and the stopping time withthe relevant physical parameters are here recovered numerically without theconsideration of any solid friction. Collisional processes are thus found asessential in explaining the physics of the qualitatively observed phenomenawhereas frictional processes can only be considered as secondary effects in thegranular penetration by impact.

Sphere penetration by impact in a granular medium: A collisional process