This activity (on page 3 of the PDF under GPS: Roller Coaster Design Activity) is a full inquiry investigation into g-force and acceleration. Groups of learners will construct their own accelerometers. Then, with permission from their local amusement park, they will ride a roller coaster with their homemade accelerometers repeatedly to make g-force readings at select portions of the track. Relates to linked video, DragonflyTV GPS: Roller Coaster Design.