.]]A pulley (also called a sheave or block) is a wheel with a groove between two flanges around its circumference. The groove normally locates a rope, cable or belt. Pulleys are used to change the direction of an applied force, transmit rotational motion, or realize a mechanical advantage in either a linear or rotational system of motion.Rope and pulley systemsRope and pulley systems (the rope may be a light line or a strong cable) are characterized by the use of a single rope transmit