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Flashcards in Chapter 2 Oral questions Deck (27):
1

Define matter

 

Any substance that occupies space and has mass

2

Name three states of matter

Solid, Liquid, gas

3

Define kinetic energy

the energy of motion

4

Work is the product of what two factors?

Force and distance moved (W = F X D)

5

What are the parts of a lever:

A rigid bar and a pivot point called the fulcrum

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6

A wheelbarrow is what class of lever?

second class

(first class: see-saw, third class: tweezers)

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7

Are all three states of matter affected by thermal expansion? If so, which is affected most?

 

All three are affected, gases are affected the most

8

What is a British Thermal Unit?

 

The amount of heat energy required to change the temperature of 1 pound of water 1 degree Fahrenheit

9

Three methods of heat transfer?

Conduction, convection, radiation

10

What term defines the temperature at which all molecular activity stops?

Absolute zero

11

Can liquids be compressed?

No, liquids are generally considered incompressible

12

What are the units used to express hydraulic or pneumatic pressure

Pounds per square inch (PSI)

13

Describe how pressure is transmitted when a force is applied to a confined liquid

Pressure is transmitted equally in all directions

14

What formula expresses the relationship between force, pressure, and area

Force = Area X Pressure (F over A I P)

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15

What is the approximate speed of sound at sea level on a standard day?

 

661 knots or 340 meters per second

16

What is the atmospheric pressure at sea level on a standard day?

 

29.92 inches mercury or 1013.2 millibars

17

On a standard day at sea level, what is temperature?

 

59 degrees Fahrenheit, 15 Celsius

18

What are the factors that determine density altitude?

Temperature and atmospheric pressure

19

What is the term used to describe the ratio between the amount of moisture actually present in the atmosphere compared to the amount the air could hold?

Relative Humidity

20

What are the four principle forces acting on an airplane in flight?

 

Lift, Gravity, Thrust, Drag

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21

What is the term that describes the angle between the relative wind and the chord line of an airfoil?

Angle of Attack

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22

What are the factors that cause a wing to stall?

when the angle of attack exceeds a critical value and the airflow separates from the upper surface and becomes turbulent

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23

What are the principle effects that result from lowering the flaps while in flight?

Lift increases, drag increases, and stall speed decreases

24

What is the function of a wing mounted vortex generator?

They delay or prevent airflow from separating from the upper surface of a wing during high speed flight (prevent boundary layer separation)

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25

How does blade flapping help to compensate for dis-symmetry of lift in helicopter main rotor systems?

Flapping increases the angle of attack and lift on the retreating blade and decreases AOA and lift on advancing blade

26

How does the airflow through the main rotor of a helicopter change during the transition from normal flight to auto-rotation?

 

During normal flight air moves downward, in auto-rotation air moves upward

27

What is friction?

opposition to relative motion between two objects in contact with each other