Figure 1
From: Collision-enhanced friction of a bouncing ball on a rough vibrating surface
(Figure prepared using Veusz https://veusz.github.io).
Bouncing ball experiment. (a) The position of the surface (blue) and ball (green) are tracked. The rotation of the ball is also measured by tracking the motion of black dots (red) on the ball surface. (b) The location of a bounce is identified when \({\mathrm{d}}y/{\mathrm{d}}t\) changes from negative to positive. (c) Histogram of \(v_x/R\omega _z\). The rolling condition occurs when \(v_x/R\omega _z=1\).
