2.2. PULLEYS AND COMPOUND PULLEYS SYSTEMS

In a system of pulleys, the equilibrium between the forces depends on the path that the rope follows.

Pulleys

A pulley is a wheel that rotates around an axis and has a groove. If we pull ropes, belts or chain, we can lift objects with less effort. Pulleys are divided into two types:

                 FIXED PULLEYS                               MOVABLE PULLEY

                                                  

Compound pulleys system

A compound pulleys system is a combination of fixed and movable pulleys. It's also called block and tackle system. We can combine pulleys in different ways:

                    VERTICAL SYSTEM                                           HORIZONTAL SYSTEM

             

                                                       

                                                EXPONENTIAL SYSTEM