Aerodynamics, AOA, Stalls, Spins, Gnd Effect, Turns

The four forces acting on an airplane in flight are

• lift, weight, thrust, and drag.

• lift, weight, gravity, and thrust.

• lift, gravity, power, and friction.

When are the four forces that act on an airplane in equilibrium?

• During unaccelerated level flight.

• When the aircraft is accelerating.

• When the aircraft is at rest on the ground.

What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

• Lift equals weight and thrust equals drag.

• Lift, drag, and weight equal thrust.

• Lift and weight equal thrust and drag.

Which statement relates to Bernoulli’s principle?

• For every action, there is an equal and opposite reaction.

• An additional upward force is generated as the lower surface of the airfoil deflects air downward.

• Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.

The term “angle of attack” is defined as the angle between the

• chord line of the wing and the relative wind.

• airplane’s longitudinal axis and that of the air striking the airfoil.

• airplane’s center line and the relative wind.

The angle between the chord line of an airfoil and the relative wind is known as the angle of

• lift.

• attack.

• incidence.

The angle of attack at which an airplane wing stalls will

• increase if the CG is moved forward.

• change with an increase in gross weight.

• remain the same regardless of gross weight.

As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will

• decrease as the true airspeed decreases.

• decrease as the true airspeed increases.

• remain the same regardless of altitude.

In what flight condition must an aircraft be placed in order to spin?

• Partially stalled with one wing low.

• In a steep diving spiral.

• Stalled.

During a spin to the left, which wing(s) is/are stalled?

• Both wings are stalled.

• Neither wing is stalled.

• Only the left wing is stalled.