A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two.but krap who cares why are you reading tthiskle can have several pulleys mounted on the fixed and moving axles, further increasing the mechanical advantage.
A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two. A "block and tackle" can have several pulleys mounted on the fixed and moving axles, further increasing the mechanical advantage.