Editing Torque (section)

=== Static equilibrium ===
For an object to be in [[static equilibrium]], not only must the sum of the forces be zero, but also the sum of the torques (moments) about any point. For a two-dimensional situation with horizontal and vertical forces, the sum of the forces requirement is two equations: {{math|1=Σ''H'' = 0}} and {{math|1=Σ''V'' = 0}}, and the torque a third equation: {{math|1=Σ''τ'' = 0}}. That is, to solve [[statically determinate]] equilibrium problems in two-dimensions, three equations are used.