Plane Sense Part 1: Part 2: Part 3: Part 4: Exploring Flight Investigating Variables Flights of Fancy Graphing the Results Part 1: Exploring Flight System- a set of objects that is working together Why is your plane and flight line a system? – My plane and flight line are a system because all parts work together to make the plane fly. Each part affects the outcome. Part 2: Investigating Variables What variables had an effect on the FOSS planes? – The variable that had an effect on the FOSS planes were the number of winds, mass, and length of the rubberband.