What is the function of a pulley?

A pulley serves a crucial role in mechanical systems by facilitating the lifting of heavy loads with greater ease. Its primary function is to change the direction of the applied force. When a rope or cable is passed over a wheel, pulling downward on one end allows you to lift an object upward on the other end. This configuration can significantly reduce the effort required to lift the load, making the task more manageable.

Using a pulley not only simplifies lifting by allowing the user to exert force in a more comfortable direction but can also be combined with multiple pulleys to further decrease the amount of effort needed, amplifying the mechanical advantage. This principle can be seen in various applications, from construction cranes to simple flagpoles, where manipulation of direction and force is key to effectively moving heavy items.