Lift, weight, thrust, and drag
Lift, weight, gravity, and thrust
Lift, gravity, power, and friction.
During unaccelerated flight.
When the aircraft is accelerating.
When the aircraft is at rest on the ground.
Between the wing chord line and the relative wind
Between the airplane's climb angle and the horizon
Formed by the longitudinal axis of the airplane and the chord line of the wing.
Lift, equals weight and thrust equals drag
Lift, drag, and weight equal drag.
Lift and weight equal thrust and drag.
Decrease the angle of descent without increasing the airspeed.
Permit a touchdown at a higher indicated airspeed
Increase teh angle of descent without increasing the airspeed.
To enabe the pilot to make steeper approaches to a landing without increasing the airspeed.
To relieve the pilot of maintaining continuous pressure on the controls.
To decrease wing area to vary the lift.
Increase if the CG is moved forward
Change with an increase in gross weight
Remain the same regardless of gross weight.
The result of the interference of the surface of the Earth with the airflow patterns about an airplane.
The result of an alteration in airflow patterns increasing induced drag about the wings of an airplane.
The result of the disruption of the airflow patterns about the wings of an airplane to the point where the wings will no longer support the airplane in flight.
Less than the length of the wingspan above the surface.
Twice the length of the wingspan above the surface.
A higher-than-normal angle of attack.
Wingtip vortices increase creating wake turbulence problems for arriving and departing aircraft
Induced drag decreases: therefore, any excess speed at teh point of flare may cause considerable floating
A full stall landing will require less up elevator deflection than would a full stall when done free of ground effect.
Settling to the surface abruptly during landing
Becoming airborne before reaching recommended takeoff speed.
Inability to get airborne even though airspeed is sufficient for normal takeoff needs.
For every action there is an equal and opposite reaction
An additional upward force is generated as the lower surface of the wing deflects air downwards.
Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.
Aerodynamic balance and controllability