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The OP's question is about the effectiveness of a material for the hammer versus another one. That is all about energy. Less effective means that some of the input energy was not used into driving the nail.haruspex said:Thought experiment: push nail a short way into ground; drop a pingpong ball onto the nail, and repeat that 1,000,000 times. How much energy have you expended in pingpong KE? How much further has the nail gone in?