This summer I travelled to Europe. I went to France, England, Scotland, Spain and Italy. To go to those places I had to take a plane. Going on a plane is scientific because in prder for an airplane to fly it must have 4 aerodynamic forces. Which are gravity, lift, drag and thrust. Thrust and lift are the forces that keep the plane flying in the air. Thrust is meant to overcme the force of the drag, which is meant to slow the plane down. Drag is used when the plane is wanting to land which is also where gravity comes in affect to allow the plane to drop from out of the air.