Chapter 2 Oral questions

Question 1

Define matter

Answer 1

Any substance that occupies space and has mass

Question 2

Name three states of matter

Answer 2

Solid, Liquid, gas

Question 3

Define kinetic energy

Answer 3

the energy of motion

Question 4

Work is the product of what two factors?

Answer 4

Force and distance moved (W = F X D)

Question 5

What are the parts of a lever:

Answer 5

A rigid bar and a pivot point called the fulcrum

Question 6

A wheelbarrow is what class of lever?

Answer 6

second class

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

Question 7

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

Answer 7

All three are affected, gases are affected the most

Question 8

What is a British Thermal Unit?

Answer 8

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

Question 9

Three methods of heat transfer?

Answer 9

Conduction, convection, radiation

Question 10

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

Answer 10

Absolute zero

Question 11

Can liquids be compressed?

Answer 11

No, liquids are generally considered incompressible

Question 12

What are the units used to express hydraulic or pneumatic pressure

Answer 12

Pounds per square inch (PSI)

Question 13

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

Answer 13

Pressure is transmitted equally in all directions

Question 14

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

Answer 14

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

Question 15

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

Answer 15

661 knots or 340 meters per second

Question 16

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

Answer 16

29.92 inches mercury or 1013.2 millibars

Question 17

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

Answer 17

59 degrees Fahrenheit, 15 Celsius

Question 18

What are the factors that determine density altitude?

Answer 18

Temperature and atmospheric pressure

Question 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?

Answer 19

Relative Humidity

Question 20

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

Answer 20

Lift, Gravity, Thrust, Drag

Question 21

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

Answer 21

Angle of Attack

Question 22

What are the factors that cause a wing to stall?

Answer 22

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

Question 23

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

Answer 23

Lift increases, drag increases, and stall speed decreases

Question 24

What is the function of a wing mounted vortex generator?

Answer 24

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

Question 25

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

Answer 25

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

Question 26

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

Answer 26

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

Question 27

What is friction?

Answer 27

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