Figure 11.
The dynamic coefficient of friction (W = 0.2 N) for a finger pad as a function of sliding velocity for (a) an optically smooth glass surface, and (b) a smooth PP surface. The steady-state dry values of the coefficient of friction, μ∞: unfilled circles and the wet values of the coefficient of friction, μw: filled circles. The lines are the best fits to equation (5.4) using the parameter values given in table 3. The data are taken from figs 18 and 19 in the study of Pasumarty et al. [62]. (Online version in colour.)