ORIGINAL: Sylvan

If I put a 100 pound weight on a scale and the scale read 100 pounds and then I added a 1 pound weight and the scale read 99 pounds, I would conclude there is something wrong with the scale. I wouldn't conclude that sometimes more mass = less weight.

Adding mass to a scale ALWAYS results in more force exerted on the scale. Increasing arrow mass ALWAYS results in increased ke. In either case, if testing indicates otherwise then something is amiss.