Asked by rivika | 19th Oct, 2009, 08:12: PM
The rolling friction = uN/R, where u = rolling coefficient of friction, N = normal reaction = mg, and R = Radius.
Rolling friction = umg/R
Let's consider a cylindrical object such as a tyre with radius R and length L, then as we increase the radius, the mass is given by ρ(πR2)L.
Hence, rolling friction = uρ(πR2)Lg/R R.
But it's true of rolling solid cylinder of uniform density ρ. It'll change as the object changes, for example it'll be directly propotional to R2 for a unifromly dense solid sphere.
Answered by | 20th Oct, 2009, 11:50: AM
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