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Zoey Adams——Studied at Princeton University, Lives in Princeton, NJ
Levers Are Useful Tools! Levers are devices that increase the force you use them with. Each lever has three main parts: the fulcrum, resistance arm, and effort arm. Do the following activity to experience the relationship between the fulcrum, resistance arm, and effort arm.read more >>+119962023-04-26 00:05:46
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