Chapter 4, Principles of Flight Flashcards

1
Q

Our atmosphere (air) is composed of 78 percent ____________, 21 percent ____________, and 1 percent other gasses.

A

Nitrogen & Oxygen

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2
Q

How does a gas, such as air, act when placed in a container?

A

It conforms to the shape and takes the entire volume of the new container

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3
Q

What is the property of a fluid that causes it to resist flowing?

A

Viscosity

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4
Q

What is the resistance that one surface or object encounters when moving over another?

A

Friction

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5
Q

Name the layer of molecules that adhere to a surface when a fluid passes along that surface.

A

Boundary layer

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6
Q

What is the resistance to airflow called?

A

Drag

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7
Q

What is the force applied in a perpendicular direction to the surface of an object often measured in pounds of force exerted per square inch of an object (PSI)?

A

Pressure

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8
Q

How will an object completely immersed in a fluid will feel pressure?

A

Around the entire surface

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9
Q

What direction will an object move if the pressure on one surface of the object becomes less than the pressure exerted on the other surfaces?

A

Toward the lower pressure

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10
Q

What is the average pressure, in pounds per square inch (psi), exerted by the weight of the atmosphere under standard conditions at sea level?

A

14.70

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11
Q

What happens to the pressure exerted by the atmosphere on an object as the object increases altitude?

A

Pressure decreases with altitude

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12
Q

What happens to the pressure of a fluid moving along a surface as its relative velocity increases?

A

Pressure decreases with velocity

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13
Q

Which part of a wing moving through the air has the least amount of pressure?

A

The top

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