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Rolling friction has been discussed earlier in this list (I had a lar=
ge number of hits which I read through). I checked John Denker's web =
A problem arises when rolling friction is analyzed further. According=
to Swartz & Miner rolling friction is the resultant of *friction* an=
d normal force which is not in line with the center of mass of the wh=
eel. They avoid talking about two friction forces: instead of static =
friction they talk about *traction*. I think that their approach is m=
ore coherent than the one I presented.=20
=20
Regards,
Antti Savinainen
Kuopion Lyseo High School/IB
Finland
Homepage: <http://kotisivu.mtv3.fi/physics/>
Reference:
Swartz, C. and Miner, T. (1998). Teaching Introductory Physics - A so=
urcebook. Spinger-Verlag, New York.