Force, Momentum, and Deformation Energy

That large objects moving at high speeds hit harder than smaller objects moving
more slowly goes without saying. In attempting to break a board, a karateka seeks to
hit the board as hard as possible. It therefore follows that the karateka should move
his or her weapon (for the purpose of this paper, the hand) as quickly as possible in
order to hit as hard as possible. But what makes for a “hard” strike? Two ways exist to
answer this question, both equally accurate