# Equilibrium

## Static equilibrium is achieved when both resultant force and resultant moment equals to zero

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Any static force system will be in equilibrium if the resultant force and resultant moment both are equal to zero.

Static equilibrium can be expressed as

ΣF_{x}= ΣF_{y}= ΣF_{z}= 0 (1)

ΣM_{x}= ΣM_{y}= ΣM_{z}= 0 (2)

where

F = force (N, lb)

M = moment (Nm, ft lb)

x, y, z = orthogonal axes

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