pic: Did Somebody Say Defense Game?

[magnets]

Originally Posted by Bryce Paputa

Adding wheels doesn't really increase your traction/pushing power, does it? I'm sure that the extra width helps, but not the number.

Adding surface area in contact with the ground (up to a point) increases traction. It doesn't matter if it's through wider wheels, or more wheels. If friction worked just the way the coefficient of friction says it will, then neither width nor number of wheels will affect traction at all. You could have three 0.1" thick wheels, and have the same amount traction, but friction doesn't follow the super simple columbic prediction, especially on carpet.