FRICTION

IN SOME SITUATIONS, I OPPOSE THE MOTION
IN OTHER SITUATIONS, FACILITATE THE MOTION
BUT, I ALWAYS OPPOSE
THE RELATIVE MOTION
BETWEEN TWO MOVING SURFACES.
PUT SOME LUBRICANT, AND
I BECOME SMALL THERE.
I MAKE THE MOVING SURFACES ROUGH
I MAKE THE MOVING SURFACES TOUGH.
I MAY BE - STATIC, SLIDING OR ROLLING
BUT WHENEVER TWO SURFACES ARE IN MOTION
I AM ALWAYS THERE.