There are mainly three types of constrained motions:
1. Completely Constrained Motion:
When the motion between a pair is limited to a definite direction irrespective of the direction of force applied, then the motion is said to be a completely constrained motion.
2. Incompletely Constrained Motion:
When the motion between a pair can take place in more than one direction, then the motion is called an incompletely constrained motion. The change in the direction of impressed force may alter the direction of relative motion between the pair.
3. Successfully Constrained Motion:
When the motion between the elements, forming a pair is such that the constrained motion isn’t completed by itself, but by some other means, then the motion is said to be successfully constrained motion.