This Instructional Activity is a part of the Lesson 5, Unit 6, Grade 8. This example presents students with a graph of a nonlinear function that both increases and decreases over different intervals of time. Students may have a difficult time connecting the graph to the scenario. Remind students that the graph is relating time to a rider's distance above the ground. Consider doing a rough sketch of the Ferris wheel scenario on a personal whiteboard for further clarification using a similar object such as a hamster wheel or a K'NEX construction toy. There are also videos that can be found online that relate this type of motion to nonlinear curves.