This a a basic activity to demonstrate the mechanical advantage of pulleys. Students can see that a fixed pulley helps only by allowing you to pull down with gravity in order to lift an object up. Movable pulleys double the amount of line pulled and decrease the effort required to lift an object. Both pulleys add friction, thereby increasing the overall amount of work done.
See the list of supplies. You may be able to make substitutions for some objects, but you will need several pulleys, string, and some sort of weight. It adds to the activity to be able to measure force with spring scales, and several varieties would work.
Both Word and PDF files are included, so you may use the activties as is, or make modification to suit your space and materials. I have included my rubric, but you may wish to modify it to meet your expectations.
I have not included an answer key. In my class, I put an emphasis on writing detailed responses in full sentences. My expectation is that during our class discussions, students will edit their responses to reflect the consensus of the class and teacher explanations.
If time allows, I prefer to let the students investigate the materials first, before beginning the activity. A great deal of learning goes on during this time, and then the activity gives it some structure and solidifies the lesson.