1.1 — The Four Forces & The Atmosphere

1. In steady level flight, which balance holds? Lift = weight, thrust = drag Lift > weight Thrust = lift All four forces are equal

2. Lift acts… Perpendicular to the relative wind Parallel to the relative wind Toward the Earth Opposite the thrust line

3. As altitude increases in the standard atmosphere, air density… Decreases Increases Stays constant Rises then falls