Principles of Flight

The control wheel or yoke is used to position the

• rudder and elevator

• rudder and ailerons

• ailerons and elevator

• ailerons, rudder, and elevator

The four forces acting on an airplane during flight are

(a)  

The force that acts downward toward the center of the earth is called

(a)  

The force that propels the airplane through the air is called

(a)  

When the four forces are in equilibrium during straight-and-level, unaccelerated flight, lift is equal to and opposite ____________, and thrust is equal to and opposite ______________.

(a)  

According to Bernoulli's Principle, when the velocity of the fluid increases, the pressure (a)   (increases, decreases).

During straight-and-level, unaccelerated flight, air pressure below the wing is (a)   (higher, lower) than air pressure above the wing.

The curved shape of a wing's upper surface tends to (a)   (accelerate, decelerate) airflow over it.

The angle between the wing chord line and the direction of the relative wind is called the

• angle of attack

• angle of incidence

• descent angle

• flight path angle

If the angle of attack is increased beyond the point of maximum lift, the wing (a)   .