Constrained Motion

Constrained Motion-Types (Completely, Successfully and Incompletely)-PDF

Amrit Kumar Theory of Machine Leave a Comment

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Constrained Motion:

A Mechanical Pair having a definite motion with respect to another element.

Types of Constrained Motion:

  1. Completely constrained
  2. Partially or Successfully constrained motion and
  3. Incompletely constrained motion

1. Completely motion:

Whenever the motion between the pair takes place in a definite direction irrespective of the direction of the force applied, then the motion is said to be completely motion.


Square bar in a square hole

Shaft with a collar at each end in the circular hole.

A piston in the cylinder of an IC engine.

Constrained Motion

2. Partially or Successfully motion:

Whenever the motion between a pair is not completed by itself but by some other means, it is said to be successfully motion.


The motion of the shaft in a footstep bearing becomes successfully constrained motion when a compressive load is applied.

Constrained Motion

3. Incompletely motion:

Whenever the motion between a pair takes place more than one direction is called incompletely motion.


Circular shaft in a circular hole, as it may be either rotate or slide in a hole. Both motions have no relationship with others.

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About the Author

Amrit Kumar

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Amrit is a Co-founder of Learn Mechanical Portal (Previously owned ""). He completed his diploma in Mechanical Engineering from Acharya Polytechnic Bangalore and also completed his B-Tech from Delhi. Amrit is now preparing for Govt. exams. If you need help, you can ask him regarding any suggestions in the mechanical engineering field. He loves to meet new people.

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