Hi jbriggs, thanks for replying!
1. Why should there be a single well-defined "impact force"?
Given that it was a straight vertical drop onto a flat surface, I figure the force of impact on landing is the important bit. The bounce/slump that sent me face first into the solid iron bars of...
So I'm trying to figure out a rather amusing problem. A month ago I was doing some work in my attic when I took a wrong step and plunged through my drywall ceiling and fell a straight 20ft to the very bottom of my stairwell landing. I was knocked unconscious instantly and don't remember...