Some useful numbers and units
A player at full speed ~ 22 miles/hour
A linebacker ~ 220 pounds
An offensive lineman ~ 300 pounds
A good punt = 4 seconds and 40 yards
A long pass = 40 yards in the air
One Lott = the energy and momentum of a 220 lb. safety at full speed
Notes:
Since Physics is a quantitative sport, let us first develop some units and measures.
A coach measures the quickness of a football player is by the time in the 40 yard dash. 4.4 seconds is a good time. The player does not go at full speed even after forty yards. Since the only players that have a chance to build up speed before a tackle ar
The lineman do not get to run so far. Indeed, they usually cannot run over 40 yards at a sprint. They make up for this by being large. Momentum = mv is the important quantity in blocking and tackling. Safeties use a large v and linemen use a large m.
Tommy Lott was a hard-hitting safety for the San Francisco 49ers.
For the sake of argument, I think that in his prime Dick Butkus was a fiercer hitter and competitor.