Holonomic constraints.

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Constraints are said to be holonomic if constraints imposed on the motion of the system can be expressed in the form of mathematical equation f(r1,r2,.....,rn,t)=0. 
where r1,r2,.....,rn are position vector of system of particles & 't' is time.
Example of holonomic constraints 
★The constraints involved in the motion of rigid bodies in which the distance between two particular points is always fixed.
★The constraints involved when a particle is restricted to move along a curve of surface are holonomic.

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