Originally posted by KingD19
In Episode 3, Obi-Wan was launched 40+ feet across a room at high speed, slammed into a metal walkway hard enough to dent the metal(probably durasteel), fell about a dozen feet to the floor, then had that walkway(hundred of pounds at least) dropped on his legs. He was ko'd, but aside from that he was perfectly fine.
Luke appeared to be hurt by a couple of the rather slow moving objects that vader hit him with during their fight in ESB.