M i right

[-=Mad=-]

Main Question or Discussion Point

is this the wriye formula of cofficient of friction

22/7 x D x n/12

 

[tiny-tim]

Welcome to PF!

Hi -=Mad=-! 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!