Why Lesson Planet?
Ask your class if they'd like to explore parabolas by flinging grapes across the room. There isn't a child alive who'd say no to that. They determine quadratic functions to fit the parabolic curves of grapes being catapulted with a spoon. They use their TI-83 graphing calculator to determine the location of the grape at various points on its flight path and to determine the curve of best fit.