Subtle Indication of 'non-resisting' use HP for Knockback calculation?

[Sunrunners_Fire]

Originally Posted by kirbwarrior

Something I've noticed is that knockback seems awfully hard to do already, considering that ST-2 (or HP-2) damage knocks you back one yard. This makes it very hard to knock someone back already. Maybe the rules need to make it easier for unresisting targets?

Take a 200-lb chunk of metal. Take a five-pound sledge to it with your full strength; once and once only. How far back does it move? How far back do you expect it to move? (And how far back do you want it to move?)

GURPS says that a 200-lb chunk of metal has 46 HP. Its' not going to suffer a yard of knockback from that blow. Technically, it should move 5 inches back. (6/(46-2) yards.) A generic human should technically be knocked back 2 feet, 3 inches by the same blow; also less than a yard. (6/(10-2) yards.)