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XPrinciples of Flight > Lesson 1 > Flashcards

Lesson 1 Flashcards

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1
Q

The SI Unit System​ stands for

A

System International en Francais

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2
Q

SI unit for velocity

A

meters per second
m/s

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3
Q

SI unit for volume

A

meters cubed
m3

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4
Q

SI unit for speed

A

meters per second
m/s

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5
Q

SI unit for acceleration

A

meters per second per second
m/s2

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6
Q

SI unit for force

A

Newtons
N

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7
Q

SI unit for pressure

A

Newton per meter square
N/m2

=

Pascal

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8
Q

SI unit for weight

A

KILOGRAM
Kg

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9
Q

SI unit for MOMENTUM

A

Kg.m/s

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10
Q

SI unit for energy

A

Joules

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11
Q

SI unit for temperature

A

kelvin

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12
Q

SI unit for power

A

watts

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13
Q

What is acceleration and what symbol and what unit

A

Rate of change in velocity
symbol: a
Unit: meters per second squared
m/s2

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14
Q

What is 1Kg in pounds Lb?

A

2.205

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15
Q

Weight is a force so expressed in what?

A

Newtons

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16
Q

What is the value for Earth’s gravitational field?

A

9.81 meters squared (g)

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17
Q

What is the equation for weight given mass and gravity?

A

weight = mass x gravity
w=mg

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18
Q

What is the name of the point that weight acts about in flight?

A

Centre of gravity

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19
Q

Newtons first law is:

A

A body will remain at rest or in uniform motion unless acted upon by an external force

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20
Q

Newton’s second law is:

A

The acceleration of a body in a straight line is proportional to the applied force and inversely proportional to the mass of the body​

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21
Q

Newton’s third law is:

A

To each and every action there is an equal and opposite reaction​

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22
Q

What is the equation for force given mass and acceleration?

A

force = mass x acceleration
f=ma

F: in Newtons
m: Mass in Kg
a: Acceleration in m/s2

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23
Q

What is the scientific definition of force?
(not the equation)

A

In scientific use, (a measure of) the influence that changes movement

F=MA

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24
Q

What is the equation for speed given distance and time?

A

speed = distance⁄time

speed: meters per second
distance: meters
time: seconds

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25
What is 1 knot in meters per second
0.5144 meters per second
26
What is velocity?
vector quality that indicates distance per time (speed) and direction.
27
Acceleration is a measure of change of what?
Velocity
28
What letter represents momentum?
p
29
What is the formula for momentum?
momentum = mass x velocity p = mv
30
In physics, WORK is a “measure “ of transfer of energy that causes a ____________ of an object
displacement
31
What is the equation for work?
work = force x distance
32
What is the unit for work?
Joules
33
Define power
Rate of doing work.
34
What is the equation for power given work and time
power=work⁄time power: watt work: joules time: seconds
35
What is the equation for power given force and speed?
power = force x speed power watt force newton speed meters per second
36
What are the two types of energy?
kinetic potential
37
Force x distance from pivot =
Moment
38
Centre of pressure
The point that the lift works from. It's usually aft of CG
39
What is ISA density?
1.225 Kg/m3
40
What is ISA pressure?
1013.25hpa
41
What is ISA temperature?
15°c
42
Volume flow = ?
frontal area x speed
43
Mass flow = ?
volume flow x density
44
What 3 factors change air density?
Air pressure Air temperature Humidity
45
What is a measure of how much water vapour (and not water?) is contained within the atmosphere​?
Humidity
46
What does increased humidity do to air density?
reduces it.
47
The atmosphere contains what percentage of Oxygen?
21%
48
The atmosphere contains what percentage of Nitrogen?
78%
49
The atmosphere has 1% of trace gasses including:
Argon CO2 Water vapour
50
What is an aerodynamic force?
a force exerted on a body by the air in which the body is immersed, and is due to the relative motion between the body and the fluid
51
As altitude increases, static pressure:
decreases
52
Dynamic pressure defines as:
the pressure of a fluid (the Air) exerted on a body due to motion or the motion of an object moving through it​
53
Total pressure is the sum of
Total pressure = static pressure + dynamic pressure
54
1nm = ???? meters
1852 meters
55
How many seconds are there in an hour?
3600
55
1nm = ???? feet
6076 feet
56
IAS measures what pressure
Dynamic
57
Dynamic pressure is represented by which letter?
q
58
Dynamic pressure can be measured in ??? or ???
Pascal's (Pa) or Netwon meters2
59
The equation for dynamic pressure is?
Dynamic pressure = 1⁄2 density x velocity squared q = 1⁄2 ρ V2
60
In the equation for dynamic pressure, what does the "V2" represent?
V is TAS
61
When density is 1.225 kg/m3, what is the relationship between TAS and IAS?
TAS = IAS
62
When density is greater than 1.225 kg/m3, what is the relationship between TAS and IAS?
TAS < IAS
63
When density is less than 1.225 kg/m3, what is the relationship between TAS and IAS?
TAS > IAS
64
What is the relationship between speed and dynamic pressure?
Dynamic pressure proportionate with speed squared Q ∝ V2
65
What are the 4 types of airspeed?
IAS indicated CAS calibrated EAS effective TAS true
66
What does CAS stand for and how does it improve on IAS?
Calibrated airspeed Corrected for Instrument and position (pressure) errors​
67
What does EAS stand for and how does it improve on CAS?
Equivalent airspeed Corrected for compressibility (mach numbers over 0.3)
68
What does TAS stand for and how does it improve on EAS?
True airspeed Corrected for density
69
Coanda effect describes?
Flow moving towards low pressure
70
Stagnation point occurs?
Leading and trailing edge of an aerofoil when dynamic pressure is zero and static pressure is high
71
The narrow part of a venturi is called the:
Throat
72
The Total pressure through a venturi remains?
Constant?
73
In a venturi, if the dynamic pressure increases then the static pressure...
decreases
74
Describe Bernoulli’s Theorem​
Bernoulli’s principle: in a flow of an ideal fluid, the sum of (static) pressure and kinetic energy per unit volume (dynamic pressure) remains constant
75
Leading edge of an aerofoil has a name...
Leading edge radius.
76
What is the line that runs from the leading to trailing edge in an aerofoil?
The Chord line
77
Alpha describes the angle between.....
Chord line and relative air flow
78
Describe The mean camber line
an imaginary line half way between the upper and lower surfaces​
79
Describe: The maximum camber (or camber)
describes the distance between the mean camber line and the chord line​
80
Explain positive and negative cambers
positive will produce lift upwards negative will produce a force downwards
81
How much lift will a Symmetrical aerofoil produce at 0°α (zero alpha)
zero
82
Describe a biconvex aerofoil.
symmetrical x and y
83
As AoA increases, where would you expect the centre of pressure to move to on a CAMBERED aerofoil?
Forward
84
As AoA increases, where would you expect the centre of pressure to move to on a symmetrical aerofoil?
Nowhere
85
Mass flow is a fundamental component for the production of aerodynamic force. Greater mass flow = ??
greater aerodynamic force

XPrinciples of Flight (5 decks)

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