[Joseph1082]

Honestly, I can be a dick back... I'll try not to.
Ok, FRICTION which is a FORCE is derived from TWO quantities, it is the NORMAL FORCE multiplied by the COEFFICIENT of FRICTION between the two surface. The NORMAL FORCE is the FORCE PERPENDICULAR to the motion and the frction (friction is a force in the opposite direction of the motion hence it opposes motion). The NORMAL FORCE is PERPENDICULAR to BOTH. When a body is sitting on the ground at rest (like a car) the NORMAL FORCE is equal to its weight... the weight is the only force perpendicular to the attempted motion (forward, backward, whatever) so the friction you must overcome to move the car is equal to the coefficient*weight... period.
And Mass and weight relate by the very easy equation W=Mg. W=weight, M=Mass, g=gravitational field strength (acceleration due to gravity).
How in Your Right Mind can you say MASS and Weight do not affect traction... Y do you think guys put sadbags in the back of their Camaros in the winter? Y do you think it is harder to push a massive obeject accross the floor than a small one.
Point example... you can push a bicycle easier than a car, right, this is obvious. The coefficent for the two is exactly the same, that between Rubber and Pavement. So Y is the car harder to push, becasue it has more MASS, which gives it more WEIGHT (W=Mg) which makes there more friction. I don't get Y you dont understand, Heavier objects make more friction, it sounds logical becasue it is. Does a Semi ever spin out???