a) Why is hammer a simple machine?
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A hammer is a lever, one of the six types of simple machines. A lever is defined as any rigid bar that pivots around a fixed point, called a fulcrum, to apply force. If using the hammer to pull the nail back out again, the fulcrum becomes the point where the top of the hammer rests against the surface holding the nail.
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because it requires mechanical power to run i.e. it needs physical strength to use.
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