As a final project for the work & simple machines unit with my sixth graders, I have them get into groups to build a complex machine that must complete a task. When introducing the project, I will pull up videos of examples on YouTube so the students have a better understanding of what is expected. Then on Demonstration Day, I usually get 2-3 teachers/administrators to come in and judge the machines as they are presented. This resource includes instructions, a rubric and analysis questions f