Question

write a note on complete and incomplete constraints in lower and higher pairs, illustrating your answer with neat sketches.​

Answer 1

Answer:

1. Completely constrained motion:

Completely constrained motion is a type of constrained motion in which relative motion between the links of a kinematic pair occurs in a definite direction by itself, irrespective of the external forces applied.

Square bar in a square hole undergoes completely constrained motion

Even when any external force is applied, a square bar always slides inside a square hole. It does not turn.

2. Incompletely constrained motion:

In incompletely constrained motion, the relative motion between the links depend on the direction of external forces acting on them. A good example of incompletely constrained motion is the motion of a shaft inside a circular hole. Depending on the direction of external forces applied, the shaft may slide or turn (or do both) inside the circular hole.

Incompletely constrained motion is undesirable in any mechanical system. It leads to improper mechanical outputs.

Explanation:

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Answer 2

Explanation:

Complete  constraints: Completely It is said to as fully motion since it occurs between the pair in a certain direction regardless of the direction of the force applied.

AS AN EXAMPLE

• Square hole with a square bar

• In the elongated hole, insert a shaft with collars at either end.

A piston within an IC engine's cylinder.

Incomplete  constraints:

There are several directions in which a pair can move.

An illustration would be a round shaft in a circular hole; it might move or revolve within the hole. There is no connection between the two motions.

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