I have a character who has managed to get herself a movement speed of 100′. She is a centaur, and as such specializes in lance based combat and charges. Now in the real world a lance moving faster would have more power behind it. With this centaur moving at 56 MPH and putting her 1473 pounds behind that lance it is striking with a force of 16,726.39 Newtons concentrated down onto the lance tip, which is something rather tiny like a hundred thousandth of an inch. This results in the lance point having 95,510,148 PSI when it strikes a target. This is enough force to pierce up to 8 inches of modern ultra-high carbon steels (assuming no loss of power by friction). In other words that lance is going into and through just about anything that gets in its path.
Now is this knowledge just a fun bit of coolness to know or does D&D reflect physics and give a damage boost for speed of a handheld piercing weapon?