Here is a great STEM challenge I frequently use with my eighth graders. Students are challenged to build a car powered by a deflating balloon. This challenge utilizes problem solving skills, knowledge of physics concepts and creative thinking. Students can use a variety of recyclables or old toys to complete the challenge.
This download includes only the instructional comic. For the full lesson plan including physics principles, check out... https://www.teacherspayteachers.com/Product/Forces-and-Motion-Balloon-Powered-Car-Lesson-Activity-1830144