Constraint Equaation..

What is constraint equation..??

First a few examples of constraint equation

a) If there is a stone tied to a rope that you are whirling around your head.. there is a constraint equation.

b) If there is a body kept on the floor..

c) the points on a solid body

d) If a pulley system is there, then every single thread on it will give a constraint equation.

The equation is nothing but the mathematical manifestation of the constraint involved..

Lets see it by examples by example...

What are your first guesses for the above?