Collision behavior for a 1 kg, 10 cm diameter spherical projectile as a function of the Froude number for different gravity levels, where a_peak is the peak acceleration, z_stop is the penetration depth, t_stop is the collision duration, g is gravity, and D is the projectile diameter. The solid line in plot (b) represents the least-squares fit to Eq. (8) when 3 < Fr < 10. The dotted line in plot (b) represents the model prediction based on Eqs. (7) and (8), and the dotted line in plot (c) represents the model prediction obtained through numerical integration of Eq. (1). Plot (a) is shown on a log-log scale for direct comparison with Fig. 3a.