This lesson for Grades 7-9 provides a complete package for a hands-on activity on the science of roller coasters. It opens with an overview of the physics concepts, including scripted teacher introduction. Students then work in groups to design roller coasters, using foam pipe insulation, glass marbles, wooden marbles, and steel marbles. Through inquiry, students build a deeper understanding of conservation of energy and the effects of friction. The package includes lesson objectives, detailed procedures, student worksheet, scoring rubric, and post-activity assessment. Allow two class periods. TeachEngineering is a Pathway project of the National Science Digital Library. It provides a large collection of teacher-tested, research-based content for K-12 teachers to connect real-world experiences with curricular content.