Fig. 5
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Evolution of the quasi-static friction force f(z) and the inertial drag force h(z)v2 for a 1kg, 10 cm diameter spherical projectile impacting glass beads under terrestrial gravity. Fd is the magnitude of the drag force. The vertical dashed lines represent zh and zstop, where zh is the depth where f(z) = h(z)v2 and zstop is the final penetration depth of the projectile.
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