A device that transmits force from one point to another for the purpose of work is a __________.

• A. Engine
• B. Mechanism
• C. Lever
• D. Pulley

Answer: (D)

Transferring force from one location to another to do work is a hallmark of a pulley. A pulley uses a wheel and rope (or belt) to carry the applied force to a load at a different point, often changing the direction of the force and providing mechanical advantage along the way. When you pull on the rope, the same force is transmitted through the rope to lift or move the load, letting you work at a distance from the load itself. While a lever also moves and supports loads, it operates around a fulcrum and mainly changes how force is applied within the same system, rather than sending it to a separate point via a flexible connector. An engine, by contrast, is about turning energy into work, not just transmitting force between locations. A mechanism is a broad term for moving parts, but it doesn’t specify the method of transmitting force to a distant point like a pulley does.