A combination of a movable and fixed pulleys?

A combination of movable and fixed pulleys is known as a block and tackle system. This arrangement allows for a significant mechanical advantage, making it easier to lift heavy loads by distributing the weight across multiple ropes. The fixed pulleys change the direction of the force applied, while the movable pulleys reduce the amount of force needed to lift the load. This setup is commonly used in various applications, such as construction and sailing, to enhance lifting efficiency.