Originally Posted by
justin70
I agree with you, friction does matter. But not for force of impact. As far as ripping your scalp off, and probably more importantly, head rotation after the ground bites into you scalp, the speed of the fall definitely matters.
Indeed, if one is moving forward, the head will most likely impact at some angle <> 90 degrees on a surface that is most likely not flat and level, in which case their forward velocity is a factor in the force of the impact. It don't take a physics major to figure that out.
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