Launch Interactive Share to Google Classroom An upward force called lift, acts on the airplane and opposes the downward forces of gravity. The lift force allows the airplane to get off the ground and stay in the air. Watch the simulation. Grades: 3 4 5 6 7 8 9 10 11 12 Subjects: SciencePhysical ScienceForces & Motion Collection: InteractivesActivitiesSimulations Series: NASA OnlineNASA Science Simulations