Pulley Characteristics: Understanding Simple Machines & Mechanical Advantage

* Simple machine: A pulley is a simple machine that consists of a wheel and a rope.

* Circular object: The wheel in a pulley is a circular object.

* Groove: The wheel in a pulley has a groove around its circumference.

* Shaft: The wheel is attached to a shaft that connects it to the object being lifted.

* Mechanical advantage: Pulleys can change the mechanical advantage of a system.

* Work: Pulleys reduce the amount of work needed to lift an object.

* Direction: Pulleys change the direction in which a force is applied.

* Efficiency: The efficiency of a pulley is less than 100% due to friction.