Which component is a grooved wheel that changes a rope's direction?

• A. Snatch Block
• B. Emergency Stop
• C. Reeving
• D. Pulley

Answer: (D)

A pulley is a wheel with a groove that guides the rope and changes its direction. As rope runs over the grooved surface, the load’s path can be redirected—up, down, around obstacles—while the groove keeps the rope in place and reduces wear and friction with bearings or bushings. In rigging, you can stack pulleys to gain mechanical advantage, but the basic component responsible for changing direction is the pulley. A snatch block is a specialized type of pulley that can be opened to insert rope without threading, which is why some might think of it as the same function, but the broad term for the grooved wheel that redirects the rope is pulley. The emergency stop is a safety device, and reeving is the process of threading the rope through the system, not the component itself.