How Planes Fly

Airplanes are amazing machines that fly high. How do they stay up instead of falling? Four main forces make it happen. First is lift. The wings are shaped to push air down. When air goes down, it pushes the plane up. This upward push is called lift. Next is thrust. Engines make the plane move forward. They push air or hot gases back. This forward motion helps the wings make lift. Then there is gravity. Earth pulls everything down. For a plane to fly, lift must be stronger than gravity. Finally, there is drag. Drag is the air pushing back on the plane. It tries to slow the plane. The plane's smooth shape helps reduce drag. When lift is greater than gravity, and thrust is greater than drag, the plane can fly. All these forces work together for a smooth flight.