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In a Nut Shell: If the forces and moments on a body or any portion of a body balance
(sum to zero), then the body is said to be in equilibrium. Forces and moments are
vectors. Recall that vectors have magnitude and direction (line of action). In statics,
vectors may act in a plane (two-components) or in space (three components). Common
coordinate systems used to describe vectors include rectangular and cylindrical
coordinate systems.
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