Types of pulleys

3º Compound A compound pulley is a combination of fixed and movable pulley systems. The simplest theory of operation for a pulley system assumes that the pulleys and ropes are weightless, and that there is no energy loss due to friction. It is also assumed that the ropes do not stretch.

3º Compound A compound pulley is a combination of fixed and movable pulley systems. The simplest theory of operation for a pulley system assumes that the pulleys and ropes are weightless, and that there is no energy loss due to friction. It is also assumed that the ropes do not stretch.