[ungerik]

So every result of a mathematical formula is true because it's math, right?

Common sense can't be true, because there is no formula for it?

[borism]

in fact it can't. in middle ages (and indeed to this day) it is common sense that heavier objects fall faster than lighter ones, yet it is blatantly false.

[lurker17]

Heavier object do fall faster than lighter ones, near the surface of the Earth, due to air resistance.

[borism]

air resistance has nothing to do with weight of an object, it depends object's aerodynamic drag.