Project 15 PT How Efficient is a pulley symtem

Picture top left and top center is where they are learning about pulleys. One pulley, two pulley, three pulley and four pulleys system to lift the load with ropes and pulleys.

The Picture top left, show the student learning how to use the pulley system. They calculate how much input work goes into the pulley system and how much work come out of the system.   They  lifting a load and looks like a four pulley system they strung up and made work.
are lifting a paint can and seeing how much work it took to lift it a foot.