  A detailed set of experiments are described that capture over a 1000
different instances of the bounce of a golf ball. Video analysis is used to
capture velocity and spin immediately prior to and subsequent to each bounce
for a wide variety of landing conditions. Data are presented from two different
turfs; one artificial and one from a typical tee. Measurement errors and
repeatability are analysed. The data are compared to predictions from models of
rigid bounce with friction, including Penner's modification to account for
elasto-plasticity. Coefficients of restitution and friction, and Penner's
effective contact angle are fit from the data. A better fit to the data is
found using a non-physical piecewise-affine landing to lift-off relationship,
which distinguishes between cases that bounce in pure slip from those that
undergo rolling. Nevertheless, even balls that undergo rolling are typically
found to lift off slipping, having undergone spin reversal. The findings
suggest that further effort needs to be spent on finding simple physics-based
models of golf-ball bounce.
