What is the primary function of a pulley?

The primary function of a pulley is to lift objects more easily by redirecting force. A pulley operates based on the principle of mechanical advantage, allowing a smaller force to lift a heavier load. By using a cable that loops around a wheel, the direction of the applied force is changed, making it easier to lift objects vertically. Instead of pulling straight down, you can pull down on one side of the rope to lift the load on the other side, effectively reducing the amount of force needed to raise the object.

This system can be particularly useful in various applications, such as construction and shipping, where heavy items need to be hoisted. The design of the pulley allows for multiple configurations, where adding more pulleys can further reduce the effort needed to lift the load, providing significant mechanical advantages in lifting tasks.