Understanding Aerodynamics

What is the primary focus of aerodynamics when dealing with everyday gases?

• The effect of gravity on liquids

• The forces of drag and lift on objects in air

• How heat moves through solids

• The chemical makeup of the atmosphere

Which statement best describes drag?

• A force that helps airplanes climb without engines

• A force that opposes motion through air

• A force that always increases speed

• A force only found in outer space

Name one situation where drag is beneficial.

(a)  

What does the drag coefficient (cd) depend on? Choose the best answer.

• Only the object’s color and weight

• Shape, speed, surface roughness, air density, and flow type

• Temperature of the object only

• Altitude only

Which shape generally has the lowest drag coefficient among the examples given?

• Flat plate

• Sphere

• Teardrop

• Face-on cube

In level flight at constant speed, how are thrust and drag related?

• Thrust is greater than drag

• Thrust equals drag

• Drag is zero

• Thrust is less than drag

Explain how a wing generates lift using Bernoulli’s principle.

Match the control surface to the motion it primarily controls: elevator, ailerons, rudder.

• Elevator-yaw, Ailerons-pitch, Rudder-roll

• Elevator-roll, Ailerons-yaw, Rudder-pitch

• Elevator-pitch, Ailerons-roll, Rudder-yaw

• Elevator-lift, Ailerons-drag, Rudder-thrust

Why do pilots lower flaps during takeoff and landing?

• To reduce both lift and drag so the plane can go faster

• To increase lift and drag so the plane can fly slower without stalling

• To turn the plane left or right

• To decrease fuel consumption during cruise

What causes an airplane wing to stall?

• Exceeding the critical angle of attack, disrupting smooth airflow

• Flying too fast at low altitude

• Using too much thrust

• Having a low drag coefficient