Fig. 7: Effect of rubbing with mud/sand on the friction coefficient.
From: Effect of grip-enhancing agents on sliding friction between a fingertip and a baseball
a Mean µmax of seamed MLB and NPB balls with and without rubbing with mud/sand. b Mean µmax of seamless MLB and NPB balls with and without rubbing with mud/sand. Each plot indicates the mean µmax for each subject, while the error bar indicates standard deviation.*p < 0.05.
