block and tackle
When two or more pulleys are used together it is called a compound pulley system.
A system of pulleys is called a block and tackle
Block and Tackle
blck and tackle
pulleys
block and tackle.
assuming that your question is what jobs are pulleys used for... then the answer is any job that you need to lift something that is heavy. The pulley give a mechanical advantage when used together with other pulleys to apply more force to move the object
groups of families but groups is more commonly used
pulleys are actually still used in elevators, cranes, and car lifts. however, they're used with motors.
When two pulleys work together, it is called a pulley system or a block and tackle system. This arrangement allows for mechanical advantage by distributing the load between the two pulleys, making it easier to lift heavy objects.
The pulley was used by the Romans to move large pieces of equipment and to create buildings. Pulleys were also used in the creation of weapons.
The pulley formula used to calculate the mechanical advantage of a system involving pulleys is MA 2n, where MA is the mechanical advantage and n is the number of pulleys in the system.