This is a problem solving activity that is similiar to Science Olympiad. Working with partners, students will be given a set of directions and a bag of materials which they will use to construct a device. Their devices will need to roll a specific disance and knock down as many empty pop bottles as possible. Students will name their devices and as they compete, all members of the class will record results. The winning team is usually given a point freebie to be used in the next chapter of study. This is a wonderful idea to be used after students have just completed a chapter of study prior to beginning the next unit. This was a student favorite, and everyone looked forward to these days. Guaranteed winning lesson plan.