hi all. i'm currently researching angular/rotational dynamics for a hobby project i'm working on (2d physics engine). A curious thought has popped up in my mind. How does a hammer work? What i mean specifically is, if you hold a hammer by the handle and swing the head at something, it will hit a lot "harder" than if you hold the head and swing the handle at your target. I don't quite grasp why, though. The total mass of the hammer is the same in both cases, and i THINK this would also apply if you swing in such a way that the velocity of the hammer is the same in both cases. Can a point on an object (the part of the hammer that connects) be said to have mass ? Is some area around the impact point relevant in determining the mass of what hits? A thought that came to my mind is that maybe it relates to the relationship between the impact point, the hammer's centre of mass, and the hammer's rotation point (the hammer that's holding it). Perhaps a greater distance between the latter two somehow adds more force (or power, or energy?) to the swing ?