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3rd Class Lever

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Last updated: Jan 13th, 2026
3rd Class Lever
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A third-class lever might be the elbow joint: when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work. Such connections between joints, called synovial joints, are fulcrums, the bones they connect are levers, and the muscles attached to them apply force (or resistance).