# M i right

## Main Question or Discussion Point

is this the wriye formula of cofficient of friction

22/7 x D x n/12

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tiny-tim
Homework Helper
Welcome to PF!

is this the wriye formula of cofficient of friction

22/7 x D x n/12
Noooo … that's the formula for the distance in feet that a cylinder of diameter D inches rolls after n turns.

Does that help?

HallsofIvy
Whether that is a formula for friction or the distance a cylinder rolls (assuming that 22/7 is an approximation for $\pi$) or the curvature of a hypersurface depends entirely upon the application- which you did not tell us!