[privong]

> Impact speed is important to the effectiveness of a collision. That's why they train to maximize this speed. Saying "the speed isn't high" in a context where maximum speed is a goal isn't a very good argument for safety.

I think you are conflating speed and quickness. Offensive and defensive lines rely on quickness (i.e., acceleration) to beat the opposing team and make a play, while other collisions (e.g., tackling) often involve speed.

I am not saying that linesmen should not be expected to sometimes suffer head trauma; I was just noting that how often a player runs into another player is not the only factor.

[Retra]

I'm not conflating anything, I'm using standard physics terms. If you want to trample over the defense you need momentum, which is a function of speed.

Sounds to me like you're arguing for no reason.

[judk]

Or you need to get to a desired position first,which is a function of total time, not top speed.