The two main forces that govern the physics of the frisbee are lift and drag. Due the curved shape of the frisbee, as it flies through the air, the airflow above it travels at a larger velocity than the air below it. The difference in velocity also creates a difference in pressure which is the lift that keeps the frisbee airborne. Drag is a force opposing the motion of the frisbee and it could be minimized by launching the frisbee at an angle. Another important factor is the spin. Throwing the frisbee with the proper spin will help it stabilize in the air due to its angular momentum.