When a solid projectile strikes a granular layer, the impact forms a crater. This impact cratering phenomenon is basically simple. It can be described as a one dimensional motion, and the underlying physics is only classical mechanics. Nonetheless, a lot of dissipative macro grains, granular media, bring intriguing features to such a simple phenomenon. Surprisingly, nobody exactly knows how a projectile stops in a granular layer, even in terms of phenomenology. Some candidates of the force model have been proposed recently. To clarify which one is the best at describing a wide range granular impacts, we are measuring the velocity of the impact and discussing its dynamics.


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