Which term refers to a device that uses mechanical advantage to perform tasks?

The term that best refers to a device that uses mechanical advantage to perform tasks is "Machine." A machine is a broad category that encompasses various devices designed to make work easier by amplifying force or changing the direction of force. Machines can include complex systems like engines or simpler mechanisms like levers and pulleys.

A machine operates based on principles of physics and mechanics, allowing users to complete tasks with greater efficiency and less effort. This can include minimizing the input force required to do a task through mechanical advantage.

While a lever does provide mechanical advantage and is indeed a type of machine, the term "machine" is more encompassing and refers to all devices that use mechanical advantage to perform tasks. Hydraulic systems and tools can also be considered types of machines, but they are more specific categories. Thus, the choice of "machine" captures the widest range of mechanical devices that utilize these principles.