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If I made a bullet out of expanded polystyrene (Styrofoam) and shot someone with it it probably would not do much damage. It simply would not have the weight and therefore not the inertia to create much of a wound. But what about if I was standing on a tiny planet with gravity so small that a conventional lead bullet weighed the same as the polystyrene one did on earth. Now the metal bullet is lightweight. Will it therefore do no great damage? I feel the answer has to be that the bullet on a small planet would do as much damage as it would do on Earth. It's obvious but I can't explain why as it seems counterintuative.
Sorry? I do not understand.