This. I threw a bit of shot dabbling in multi events, and as a lighter guy (145) if my timing wasn't exactly right, the force of the throw would send ME backwards, which, assuming a relative conservation of momentum, means that the shot was probably 2-3 feet shorter than it would have been if my feet had been planted more firmly in the ground, or if I was 50 pounds heavier.
not newton wrote:
Intuitively you'd think it must related to simple mechanics: momentum, the thermodynamic law "for every reaction, there's an equal and opposite reaction."
As in, a hypothetical 140 lb runner who is equally strong as a 280 lb world-class shot putter would still only have about half the kinetic energy rotating before the throw. And if he were nonetheless able to manage a competitive throw, it'd probably knock him 10 meters back onto his ass.
The difference would be less for a 230 lb muscular but lean guy, but same principles apply.
Surely someone who's taken college physics in the last two decades could be more certain and more articulate about this.