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Gravity helps create lift for paper airplanes. Gravity is the force that pulls objects toward the Earth. Lift is the force that pushes an aircraft into the air. When paper airplanes are thrown up, gravity pulls them down. This movement causes a difference of air pressure on the airplane wings, which then causes lift. Bernoulli's Principle explains how a difference of air pressure is caused due to air moving faster on top of the wings than on bottom. It is because of gravity that paper airplanes are able to produce this difference and glide!