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Re: help me please
Sure.
Inline means straight ahead. A bicycle wheel usually rolls inline and not traverse.
Traverse is sideways. If you grabbed a bicycle by the wheels and dragged it, that's traverse.
Static means not moving relative to the ground. On a bicycle, unless the wheels are skidding, that's static friction. Note that this doesn't mean the wheel is not moving, just that it is not slipping against the ground.
Dynamic means it is slipping.
So, a wheel happily rolling down the field with no slip sees 0.06. One skidding down the field sees 0.05.
What does 0.06 mean? 0.00 means there is no friction at all, 1.00 means they are solidly locked (maybe glued together?). Anything in between is how much they can slip, or more accurately how easily they can slip against each other. This Coefficient of Friction is denoted by the greek letter Mu.
A rubber tire against dry pavement has a Mu of maybe 0.8 or 0.9
That same tire has a Mu of about 0.1 or 0.2 on smooth ice.
A spiked golf shoe has a mu close to 1.00 on carpet.
Does that help?
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