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"'Professor,' Captain Nemo replied, “static objects mustn’t be confused with dynamic ones."--Twenty Thousand Leagues Under the Seas (1870) by Jules Verne

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Statics is the branch of mechanics concerned with the analysis of loads (force, torque/moment) on physical systems in static equilibrium, that is, in a state where the relative positions of subsystems do not vary over time, or where components and structures are at a constant velocity. When in static equilibrium, the system is either at rest, or its center of mass moves at constant velocity.

By Newton's first law, this situation implies that the net force and net torque (also known as moment of force) on every body in the system is zero. From this constraint, such quantities as stress or pressure can be derived. The net forces equaling zero is known as the first condition for equilibrium, and the net torque equaling zero is known as the second condition for equilibrium. See statically determinate.

See also


  1. Not able to change.
  2. Fixed in place.
  3. Having no motion.

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