Unit 2 Exam Review

Fill in the blank. Leonardo da Vinci’s flying machine, the ornithopter, was an invention that (a)   .

• resembled a parachute

• launched from and landed on water

• had rotating blades, powered by humans

• flapped its wings like a bird

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 (a)   by flapping their wings.

• Air pressure

• lift and thrust

• drag and pull

• height and weight

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 (a)   .

• lift

• equilibrium

• thrust

• velocity

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

• Wings

• Head

• Tail

• Beak

For modern day gliders, what does Bernoulli’s Principle demonstrate?

• The speed of the air is faster as it hits the top of the wing causing an increase in pressure and creating lift. This permits flight of the glider.

• Air slows down as it hits the top of the wing, which increases pressure and creates drag. This permits the flight of the glider.

• Air moves faster over the top of the wing than air moving below the wing. This creates an area of low pressure on top of the wing, which lifts the glider up.

• An airplane’s wing is an obstacle to the oncoming air. As the air meets the wing, its path widens.