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36 Cards in this Set
- Front
- Back
Forces in motion are said to be ____________.
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Dynamic
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An ______ is any machine that is capable of flying through the air.
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Aircraft
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Name the two natural forces acting upon and airplane in flight: _____ and______.
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Gravity and drag
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If a control surface, such as a vertical or horizontal stabilizer, does not move or provide lift, can it still be considered an airfoil?_______.
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Yes
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Air is made up of several gases. Which one of these gases makes up the greatest percentage in the atmosphere? ____
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Nitrogen
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A hot air balloon has no horizontal control, pilots achieve some directional changes by seeking changes in______ _____at various altitudes.
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wind direction
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A balloon operates on the principle of _________.
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buoyancy
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The main body of a hot air balloon?
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envelope
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A lightweight, low carbon fuel used in hot air balloon burners
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propane
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The heat source for filling an envelope with hot air is known as the ____________.
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burner
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What is the great force that drives the motion of our atmosphere?
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Sun
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A column of air that moves vertically is known as _______.
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thermal
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The distance a glider will travel forward in relationship to the loss of altitude is_____________.
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glide ratio
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The ratio between the span of a wing and its chord is called?
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aspect
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Fluid motion due to regions of unequal heating is called?
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convection
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The wing of a propeller is called the ________.
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blade
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The tip of a propeller achieves most of its lift because of greater ____________.
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speed
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A propeller is actually a wing lifting ______.
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forward
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If an elevator and stabilizer are combined to make one control surface that acts by changing angle of attack, it is called a ___________.
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stabilator
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The _____causes the aircraft to yaw about its vertical axis.
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rudder
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The ailerons cause the aircraft to ____about its longitudinal axis.
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roll
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The elevator causes the nose to _____ up and down.
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pitch
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The point where all three axes come together is called the _______
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center of gravity
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What axis passes through an airplane from wingtip to wingtip?
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lateral
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What axis passes through an airplane from top to bottom?
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vertical
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What axis passes through an airplane from nose to tail?
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longitudinal
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The point at which a wing will stall?
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critical angle of attack
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What are the four ways of increasing lift in an airfoil?
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increase speed, increase camber, increase area, increase angle of attack
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Name the two artificial forces acting upon an airplane in flight.
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Thrust and lift
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A curvature on the top of a wing, is called the __________.
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Camber
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As air passes under a wing, a certain amount of lift is generated. This is an example of______Law.
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Newton's
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A bird has two control surfaces for maneuvering. What are they?
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Tail feathers and wing feathers
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As a fluid, like air, is accelerated, the ______drops. This is an example of ___________Law.
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Pressure, Bernoulli's
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The line between the leading and trailing edges of a wing. What is it called?
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Chord
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The curvature, or camber, on the upper surface of a bird's wing, is an example of what kind of lift?
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Bernoulli
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The _______is an imaginary line, in an airfoil, that connects the leading and trailing edges.
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Chord
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