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I am using Knight's text for scientists and engineers (copyright 2004)
and I have a couple of questions on what he says about friction. On
page 134 he gives three equations for friction:
static: f_s <= mu_s n
kinetic: f_k = mu_k n
rolling: f_r = mu_r n
2. Would mu_r (the coefficient for rolling friction) be any different
than, say, mu_s? And, why would rolling friction always be the same?
In my mind, I can accelerate a car with a whole range of accelerations
so the rolling friction must be able to vary also. What am I missing?