Figure 5
From: Collision-enhanced friction of a bouncing ball on a rough vibrating surface
(Figure prepared using Microsoft Publisher and Veusz https://veusz.github.io).
Histogram of the phase of ball bounces (left) relative to the surface height (right). The probability of a collision during the upwards phase of the surface is strongly enhanced. Inset: Schematic showing the asymmetry due to surface structure. As \(v_x\) increases, the relative probability of hitting ‘upwards’ sloping collections of particles increases. The contributions to the relative contact velocity of the ball–surface contact when components are taken parallel to the local surface geometry.
