The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
A
0
B
1
C
2
D
– 1
Correct Answer:
When n = 0, then the mechanism forms a structure and no relative motion between the links is possible. When n = 1, then the mechanism can be driven by a single input motion. When n = 2, then two separate input motions are necessary to produce constrained motion for the mechanism. When n = – 1 or less, then there are redundant constraints in the chain and it forms a statically indeterminate structure.