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Constraint (classical mechanics) : ウィキペディア英語版 | Constraint (classical mechanics) In classical mechanics, a constraint is a relation between coordinates and momenta (and possibly higher derivatives of the coordinates). In other words, a constraint is a restriction on the freedom of movement of a system of particles. ==Types of constraint==
*First class constraints and second class constraints *Primary constraints, secondary constraints, tertiary constraints, quaternary constraints. *Holonomic constraints, also called integrable constraints, (depending on time and the coordinates but not on the momenta) and Non-holonomic constraints *Pfaffian constraints *Scleronomous constraints (not depending on time) and rheonomous constraints (depending on time). *Ideal constraints: those for which the work done by the constraint forces under a virtual displacement vanishes.
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