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Rigid Objects in Equilibrium

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In an isometric exercise a person places a hand on a scale and pushes vertically downward, keeping the forearm horizontal (please see attachment). This is possible because the triceps muscle applies an upward force M perpendicular to the arm, as the drawing indicates. The forearm weighs 25.0 N and has a center of gravity as indicated. The scale registers 112 N. Determine the magnitude of M.

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A problem involving forces on human body during an isometric exercise is discussed in the solution. Equilibrium concepts have been used in finding the force exerted on a person's forearm. A diagram is used to indicate the force involved.

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