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Examples of granular materials, or large collections of discrete macroscopic grains, exist in abundance, from rice and cereal to sand and rocks. However, the physics of granular media present significant complexities that are still poorly understood. Impact of granular targets by solid projectiles is an experimental approach to understanding force transmission in soft matter. A granular target can cause a free-falling projectile to come to an abrupt stop as its momentum is dissipated to the grains. A complete interpretation of the stopping force, incorporating grain-scale interactions during impact, remains unresolved. We use direct force measurements and high-speed imaging to determine the forces acting on a projectile as it decelerates through a dense granular medium. These impact studies probe the unique response and properties of granular media.

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