In mechanical systems, which type of joint allows for rotational movement?

A revolute joint allows for rotational movement around a single axis. This type of joint is commonly found in various mechanical systems, such as in hinges and rotating shafts, where the primary function is to permit rotation while restricting translational motion. The revolute joint can be thought of as a pivot point that allows two components to rotate relative to one another.

In mechanical design, this joint is essential for applications where parts need to move in a circular path. For instance, in robotic arms, revolute joints are used at the joints to provide motion and flexibility in movement, enabling tasks that require specific angles of rotation.

Other types of joints, such as fixed joints and prismatic joints, serve different purposes. A fixed joint does not allow any relative motion between the connected components, and a prismatic joint enables translational movement along a straight path without rotation. A universal joint, while allowing for rotational movement, does so in a non-linear way compared to a simple revolute joint, accommodating rotation about multiple axes but complicating the motion. Thus, the revolute joint is the direct answer to the question regarding rotational movement in mechanical systems.