The same maneuvers require larger forces when executed by more massive players. A player must be able to take what he dishes out. When he applies a force to an opponent, he is acted on by a force of equal magnitude. Good footing is important. Forces exerted by the ground play an important role in all maneuvers.
Leverage is important.
If the force has a large lever arm the opponent can be spun around. In the coming weeks we will explore the physics of the forces on the field.