Question: (a) Suppose that we fix one node in a planar structure and put a second node on a roller. Does the structure admit any rigid

(a) Suppose that we fix one node in a planar structure and put a second node on a roller. Does the structure admit any rigid motions?
(b) How many rollers are needed to prevent all rigid motions in a three-dimensional structure? Are there any restrictions on the directions of the rollers?

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