Phys. Rev. Lett. 101, 068001 (2008) [4 pages]Projectile Interactions in Granular Impact CrateringReceived 21 March 2008; published 8 August 2008 We present evidence for the interactions between a ball and the container boundaries, as well as between two balls, that are mediated by the granular medium during impact cratering. The presence of the bottom boundary affects the final penetration depth only for low drop heights with shallow filling, in which case, surprisingly, the penetration becomes deeper. By contrast the presence of the sidewall causes less penetration and also an effective repulsion. Repulsion is also found for two balls dropped side by side. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.068001
DOI:
10.1103/PhysRevLett.101.068001
PACS:
45.70.−n, 47.57.Gc, 81.70.Bt
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