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Degrees of freedom (mechanics)
number of independent parameters that define its configuration; number of parameters that determine the state of a physical system and is important to the analysis of systems of bodies
In physics, the degrees of freedom (DOF) of a mechanical system is the number of independent parameters that define its configuration or state. It is important in the analysis of systems of bodies in mechanical engineering, structural engineering, aerospace engineering, robotics, and other fields. The position of a single railcar (engine) moving along a track has one degree of freedom because the ... Wikipedia