because they are very important to the world and we use them everyday such as a wheel and axle that are used on doorknobs.
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Probably the pulley amongst the simple machines is having the greatest impact on mankind.
A train is not a simple machine.
A complex machine.
A fulcrum is a part of a simple machine, the lever. Without the fulcrum what is left of the simple machine can no longer increase the applied force and is no longer a simple machine.
A spade is a simple mechanical (tool) machine.