Ive been trying to find formulas that help describe the torque needed to rotate a flat disk on a flat surface when the coefficient of friction between the 2 materials is known.(adsbygoogle = window.adsbygoogle || []).push({});

The first surface is a glass window (so a vertical plane) the second surface is a rotating disk of wet sponge "cleaing it" (also a vertical plane).

So im looking for a formula that takes into consideration friction between the surfaces, speed of rotation, radius (or area) of the contact surface and torque required to start the disk spinning.

Any suggestions?

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# Equation of a rotating disk

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