Methods of forming cutting elements with cutting faces exhibiting multiple coefficients of friction, and related methods

A method of forming a cutting element for an earth-boring tool, comprising:

• forming a superabrasive substantially planar cutting face on the cutting element;
• forming a first area of the superabrasive substantially planar cutting face to have a first average surface roughness;
• forming a second area of the superabrasive substantially planar cutting face to have a second average surface roughness greater than the first average surface roughness, the second area comprising two or more portions separated by the first area;
• and
• further comprising forming the two or more portions of the second area within a first semicircular half of the superabrasive substantially planar cutting face, and forming the first area of the superabrasive substantially planar cutting face within the first semicircular half of the superabrasive substantially planar cutting face, wherein an arrangement of the first area and the second area on a second semicircular half of the superabrasive substantially planar cutting face is different from the arrangement of the first area and the second area on the first semicircular half of the superabrasive substantially planar cutting face.