Talk:Airbending/@comment-80.56.56.8-20110103164522

The usage of the term "Inertia" is inappropriate in many cases. The correct word is "Momentum".

Inertia is the unwillingness of heavier objects to start moving. I.e. a wooden ball has a lower amount of inertia than a lead ball of the same size. Mass is the sole contributor to this effect.

Momentum is the amount of kinetic energy a moving object has. Both mass and speed are factors. I.e. if a 10lbs ball was moving at a speed of 3mph, it would have double the Ek of a ball that was 5 lbs and traveling 3mph, or 10lbs and 1,5mph.

Also, momentum can be passed on (think about a cue-ball), inertia cannot.