Hinge

A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, and all other translations or rotations are prevented; thus a hinge has one degree of freedom. Hinges may be made of flexible material or moving components.

In biology, many joints function as hinges, such as the elbow joint.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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