ORIGINAL: GMMAT
When you start mentioning a part of the arrow that's being propelled from a bow "pulling" another part (upon impact).......you've overshot my engineering capacity.
Exit stage left...
Interesting, though
Well basically the arrow starts slowing down as soon as it leaves the bow string so the portion of the arrow with the most mass will have the greatest amount of momentum and this spot is the front of the arrow. So since it is slowing down and losing energy slower than the rest of the arrow, it must pull the rest of the arrow along.