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
cuz they are called PULLeys
blck and tackle
Block and Tackle
pulleys
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
block and tackle.
It is called a compound machine.
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.
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.