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Ohio State University
Ohio State Univ.: Simple Machines & Mechanical Advantage [Pdf]
This site details how simple machines create a mechanical advantage for humans. Levers, theoretical mechanical advantage, actual mechanical advantage, and pulley systems are discussed.
CK-12 Foundation
Ck 12: Plix: Simple Machines: Lever
[Free Registration/Login Required] Drag the labels to identify the different parts of the wheelbarrow as parts in a lever.