<P> 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 . </P> <Ul> <Li> First class constraints and second class constraints </Li> <Li> Primary constraints, secondary constraints, tertiary constraints, quaternary constraints . </Li> <Li> Holonomic constraints, also called integrable constraints, (depending on time and the coordinates but not on the momenta) and Nonholonomic system </Li> <Li> Pfaffian constraints </Li> <Li> Scleronomous constraints (not depending on time) and rheonomous constraints (depending on time). </Li> <Li> Ideal constraints: those for which the work done by the constraint forces under a virtual displacement vanishes . </Li> </Ul> <Li> First class constraints and second class constraints </Li> <Li> Primary constraints, secondary constraints, tertiary constraints, quaternary constraints . </Li>

What do you mean by constraints discuss its types