Statics
Statics is the branch of mechanics that is concerned with the analysis of loads 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 on every part of 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.