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aircraft technical knowledge > General Thecnical Knowledge And Physics > Flashcards

General Thecnical Knowledge And Physics Flashcards

1
Q

State the International System and ICAO units used to express,

Distance

A

Meter or foot

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2
Q

State the International System and ICAO units used to express,

Time

A

Seconds or minutes

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3
Q

State the International System and ICAO units used to express,

Velocity

A

Knot

(Refers to speed and direction)

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4
Q

State the International System and ICAO units used to express,

Mass

A

Lb or kg

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5
Q

State the International System and ICAO units used to express,

Volume

A

m3

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6
Q

State the International System and ICAO units used to express,

Temperature

A

Degrees Celsius

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7
Q

State the International System and ICAO units used to express,

Altitude

A

Feet

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8
Q

Define and where appropriate show the relevant relationships between,

Mass, weight and gravitational force

A

Weight = mass x gravity
Weight = m x g

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9
Q

Define and where appropriate show the relevant relationships between,

Inertia

A

A bodies inertia is related to its mass and whether it is moving or stationary . A body with mass will continue in its state of movement or rest until a force is applied.

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10
Q

Define and where appropriate show the relevant relationships between,

Momentum

A

Momentum = mass x velocity

Momentum = m x V

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11
Q

Define and where appropriate show the relevant relationships between,

Equilibrium

A

A state of zero acceleration.

Relates to straight line travel as a body on a curved path at a constant speed is not in equilibrium as there are multiple forces holding it to that path.

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12
Q

Define and where appropriate show the relevant relationships between,

Force vectors,couples and components

A

Force vectors are the resultant force outcome after two forces with different directions have been applied together.
A vector quantity is defined as that which has magnitude and direction

Couples are two equal,parallel and opposite forces.
The moment of a couple (torque strength) is determined by one of the two forces multiplied by the distance between the forces.
An example given would be a 50lb force at each end of a 2 foot arm would have a calculated moment of 100 foot/lbs

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13
Q

Define and where appropriate show the relevant relationships between,

Newton’s third law

A

For every action there is an equal and opposite reaction.

Not the same as force ie, only when all forces are balanced can you say there are equal and opposite reactions. If there is acceleration then the forces are not exactly equal and opposite.

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14
Q

Define and where appropriate show the relevant relationships between,

Distance,time,acceleration and velocity

A

Distance over time is speed and with a direction included you get velocity

Velocity means speed and direction, ie;wind at 20 degrees at 15 kts

Acceleration is rate of change of velocity. Understand that by altering either the velocity or direction of an object it is accelerating

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15
Q

Define and where appropriate show the relevant relationships between,

Kinetic and potential energy

(Kinetic energy also known as Dynamic energy)

A

Kinetic energy = 1/2 mass x Velocity squared
This means that.
1, if you increase the mass at a given velocity you increase the kinetic energy and/or
2, a mass having a greater velocity will have a greater kinetic energy

Potential energy
That which is stored or available for use under certain conditions.
Eg,
A mass with height can fall due to gravity.
A spinning rotor can have RRPM that can be applied to create a force

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16
Q

Define and where appropriate show the relevant relationships between,

Force, work and power

A

Force is proportional to mass x acceleration

Work - a body that possesses energy can do work. Work is the consumption of energy in the pursuit of generating force

Power is the rate at which that work is done.
1 joule per second = watt

17
Q

Define and where appropriate show the relevant relationships between,

Forces involved in the motion of an object travelling in a circular path

A

Newton’s first law states that bodies in motion travel at straight lines. In order to curve their path a centripetal force is required.
This centripetal force is an accelerating force so will require more energy to maintain constant speed. It also means that if the required centripetal force required to maintain constant speed is not increased there will be a deceleration of the body

Centripetal force (CPF) = mass x Velocity squared / radius

18
Q

Review 1

  1. The inertia of a body is determined by its ————, changes in altitude ( do, do not) affect inertia
A

Mass
Do not

19
Q

Review 1

2.when a helicopter flies at increasing airspeed its inertia ( does, does not) change but its momentum ( increases, decreases, remains constant)

A

Does not
Increases

20
Q

Review 1

  1. When the mass of air through a rotor system becomes less, the downward acceleration must be ( greater, smaller) to provide the same opposing force to weight.
A

Greater

21
Q

Review 1

  1. When a helicopter is in a steady rate turn at a constant airspeed, the aircraft ( is, is not) accelerating because it is constantly changing its———-
A

Is
Direction

22
Q

Review 1

  1. During a constant radius/steady rate turn at a constant airspeed, all forces acting on the helicopter ( are, are not) balanced and the aircraft ( is, is not) in equilibrium.
A

Are
Is not

23
Q

Review 1

  1. Ignoring fuel burn off,as an aircraft continues to gain altitude, its mass ( does, does not) vary, earth attractional force becomes (stronger, weaker) and the aircraft’s weight becomes( less, more)
A

Does not
Weaker
Less

24
Q

Review 1

  1. Assuming the mass of an aircraft and its airspeed remain constant, the centripetal force required turn it on a reducing radius must be ( greater, smaller)
A

Greater

25
Q

Review 1

  1. A couple consists of ———- equal, parallel and opposite forces, and when these forces act around a point that is equal distance between the forces, the couple tends to produce ———
A

2
Rotation

26
Q

Review 1

  1. The strength of a moment is ( increased, decreased ) when the lever arm increases
A

Increased

27
Q

Review 1

  1. Assuming your helicopter has a constant mass, its kinetic energy ( doubles, quadruples ) when its airspeed doubles
A

Quadruples

aircraft technical knowledge (4 decks)

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