Never tested this but I thought it was interesting....
When you hit the cue ball hard, for a split second at the moment of impact the spot you hit gets very hot... over 100 degrees. Especially with a phenolic tip on a break shot. It wears off right away but if you could somehow touch it just after impact, it'd probably burn like a lit cigarette.
This the cause of the white 'break tracks' you see on heavily used tables... it's not just that the sliding
action of the cue ball is wearing out the cloth, it's also that hot spot scorching it a little.
In
this fascinating video they show the hot spot on a thermal camera, check out the shot around the 1:00 minute mark.
Also, those white tracks along the rails... they probably are not caused by the simple sliding or rolling action
of the cue ball when you do rail cuts. They happen because whenever a ball hits the cushion, it reverses direction
and spins in place for a second while rebounding off the rail. That split second of spinning in place wears the cloth
a bit, and after thousands and thousands of balls hitting the rail, you get a continuous white stripe
along all the cushions.