Aerospace Unit 2 Pre-test

Leonardo da Vinci’s flying machine, the ornithopter, was an invention that __________.

• flapped its wings like a bird

• sailed on water like a boat

• dug into the ground like a mole

• flew using jet propulsion

Which of the following best explains why wind tunnels are used in testing the design of aircraft?

• To test scale models of airfoils and aircraft

• To study why an airplane crashes or malfunctions

• To correct any human errors made during manufacturing

• To conduct a test flight of an aircraft without effects of weather

Which of the following represents a contribution Greek myths made to civilization today?

• Early flight techniques

• Inspiration for human flight

• Earliest designs of airplanes

• Scientific concepts related to flight

Which concept(s) best illustrates the mechanics of flying a hot air balloon? Select all that apply.

• density

• gravity

• weight

• buoyancy

What does the camber of an airfoil refer to?

• The straight line that connects the leading edge to the trailing edge of the wing

• The distance between the top and bottom of the wing

• The symmetry of the wing

• The curve of the wing

Birds generate _______ by flapping their wings.

• Lift

• Heat

• Sound

• Electricity

What is the purpose of the burner of a hot air balloon?

• It warms the air just outside the balloon causing it to rise.

• It warms passengers at high altitudes.

• It heats the air inside the balloon causing it to rise.

• It lowers the weight of the basket by warming the balloon.

When the four forces of flight are balanced, the flying object is said to have ________.

• equilibrium

• instability

• drag

• lift

What part of a bird most resembles the propeller on an aircraft?

• Wings

• Head

• Tail

• Beak

Hot air balloons rise because warm air in the balloon _______, lifting the balloon.

• becomes less dense

• becomes more dense

• cools down

• loses pressure