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Momentum is just mass times velocity. It means it will hurt much more getting hit by a heavy guy running into you than by a tiny guy even though they run at the same speed, because the bigger guy has greater momentum. I think you might be looking for F=m*a, where F is the force, or "action" in your case, the action of pushing off against the ice or something. And the heavier you are, the harder you must push to get the same acceleration.
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