# Chapter 2 Oral questions Flashcards

1
Q

Define matter

A

Any substance that occupies space and has mass

2
Q

Name three states of matter

A

Solid, Liquid, gas

3
Q

Define kinetic energy

A

the energy of motion

4
Q

Work is the product of what two factors?

A

Force and distance moved (W = F X D)

5
Q

What are the parts of a lever:

A

A rigid bar and a pivot point called the fulcrum

6
Q

A wheelbarrow is what class of lever?

A

second class

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

7
Q

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

A

All three are affected, gases are affected the most

8
Q

What is a British Thermal Unit?

A

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

9
Q

Three methods of heat transfer?

A

10
Q

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

A

Absolute zero

11
Q

Can liquids be compressed?

A

No, liquids are generally considered incompressible

12
Q

What are the units used to express hydraulic or pneumatic pressure

A

Pounds per square inch (PSI)

13
Q

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

A

Pressure is transmitted equally in all directions

14
Q

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

A

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

15
Q

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

A

661 knots or 340 meters per second

16
Q

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

A

29.92 inches mercury or 1013.2 millibars

17
Q

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

A

59 degrees Fahrenheit, 15 Celsius

18
Q

What are the factors that determine density altitude?

A

Temperature and atmospheric pressure

19
Q

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?

A

Relative Humidity

20
Q

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

A

Lift, Gravity, Thrust, Drag

21
Q

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

A

Angle of Attack

22
Q

What are the factors that cause a wing to stall?

A

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

23
Q

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

A

Lift increases, drag increases, and stall speed decreases

24
Q

What is the function of a wing mounted vortex generator?

A

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

25
Q

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

A

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

26
Q

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

A

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

27
Q

What is friction?

A

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