Single pulley systems can be seen in cranes, lifting a bucket from a well, raising a flag or adjusting window blinds. Figure caption, A single fixed pulley has a mechanical advantage of one One ...

The solution? A pulley system to make everything easier. The concept is simple. [Barnso]’s system uses three pulleys. The headphone cable goes to the PC, and then runs over the first pulley.

By using multiple pulleys in a system known as a block and tackle, the force required to lift a weight can be significantly decreased, although this requires moving the force over a greater distance.