A-level · Moments

Ladders, pegs and hinged rods in equilibriumExam-style questions

How to keep a leaning ladder, a rod resting on a peg or rail, or a hinged rod in equilibrium: draw every contact force the right way, take moments about the point that removes the most unknowns, resolve twice, and use friction's limit to find the coefficient of friction, how far a person can climb, the largest push, or the magnitude and direction of the force at a hinge.

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