Which robot system is responsible for enabling movement and mobility and is a key component in the robot’s design?

• A. Structural
• B. Joint
• C. Sensory
• D. Mechanical

Answer: (B)

Movement in a robot comes from joints—the interfaces that connect rigid links and allow relative motion. Actuators drive these joints, turning electrical or pneumatic energy into rotation or translation, which gives the robot its degrees of freedom. The frame or structure provides strength and shape, but without joints there’s no bending, swiveling, or locomotion. Sensory systems add perception and feedback, and the mechanical frame is the static backbone, but the ability to move relies on those joints. That’s why the joint is the component that enables movement and mobility and is essential to how the robot is designed.