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what is a simple machine and i have a project where i have to build a toy that contains at lest three simple machinesand is cabable of completing a task with minimal or no human intervention details please

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A simple machine is a pully, lever, wheel and axle, inclined plane. You could use a ramp and roll a marble down it. That's one simple machine. Then the marble can roll into a wheel and turn it which is another simple machine. Lastly, the wheel could push down a lever which could make something else happen, which is the third inclined plane.
i like the idea but what kin of wheel?
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