How Planes FlyEver wonder what keeps them up there? How do they do it? Here's how it's done:
An aircraft in flight is acted upon by four forces: lift, gravity, thrust and drag. Each of these oppose each other, and balance each other out like this:
Lift = Gravity
Thrust = Drag
What are they and what do they do?Thrust: It's the force that moves an airplane forward through the air. It's made by a propeller or a jet engine.
Drag: This is the air resistance that tends to slow the forward movement of the airplane.
Gravity: It's the force that pulls all objects towards the earth.
Lift: This is the upward force that is created by the movement of air above and below a wing. Air flows faster above the wing and slower below the wing, creating a difference in pressure on the wing, pushing up, and keeping it flying.