Yes, acceleration comes into it. That's probably what he meant here, I should imagine:-

Originally Posted By: Scott Barlow
Length of time of impact also has a great deal to do with the force of the blow too.

But velocity shouldn't be dismissed so easily! After all, that's what "high velocity" weapons (as in small arms, tank guns etc.) are all about. And then we're back do giving up it's kinetic energy, as it (the bullet, or projectile, that is) decelerates ...er, rapidly upon impact.

Kinetic Energy = (Mass/2)*(Velocity squared) ... I think I've got that right (?) ... and all that KE gets given up into the ribs (or wherever) ... plus the elbow! All in Joules, of course.

Meanwhile, back to 9's and *252's. It's nice to discover, Mike, that I'm not alone! smile

* That was (is?) the number given to the army charge sheet, by the way - AF-252. See, numbers do matter!

If you don't inspect ... don't expect.