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This is a student investigation where several objects are rolled down an inclined table. The objects accelerate at different rates and some reach the bottom quicker than others. As part of this experience, students are challenged to produce two objects for our "roller derby" competition.The challenge is to make one object that will roll down the table as quickly as possible, the other object is to roll down the incline as slowly as possible. The objects are then raced against each other to determine whose object is the quickest and whose is the slowest.