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Josh Gates
For starters, there are at least _four_ different notions of friction
that apply:
a) friction transverse to the rolling, which prevents the tire
from skidding sideways. This is important during cornering.
b) friction along the direction of roll, which prevents the
tire from spinning freely. This is particularly important
during acceleration from a stop.
c) friction that causes dissipation during rolling.
This includes internal friction in the sidewall as
it flexes, plus some sliding friction as different parts of the
footprint squirm relative to each other and therefore relative
to the road.
d) Dynamic friction during outright skidding.