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My General Oral Questions > Basic Physics > Flashcards

Basic Physics Flashcards

1
Q

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

A

14.7psi or 29.92 inches of mercury

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2
Q

What is kinetic energy?

A

Energy in motion

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3
Q

What is the definition of a British thermal unit?

A

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

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4
Q

What are three methods of heat transfer?

A

Conduction, convection, and radiation

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5
Q

What is the definition of friction?

A

Opposition to the relative movement between two objects

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6
Q

What are the two factors involved in work?

A

Force and movement

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7
Q

What does a basic lever machine consist of?

A

A rigid bar, free to pivot on or rotate about a pivot called the fulcrum

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8
Q

What class of lever is a wheelbarrow?

A

A second class lever

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9
Q

What is standard day temperature in degrees fahrenheit?

A

59 degrees F

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10
Q

What factors determine density altitude?

A

Pressure and Temperature

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11
Q

What is the term used to describe the ratio of the amount of water vapor actually present in the atmosphere to when the air is saturated with water vapor?

A

Relative humidity

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12
Q

In what direction is pressure transmitted when force is applied to a confined fluid?

A

Equally in all directions

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13
Q

How is pressure expressed in hydraulics and pneumatics?

A

Pounds per square inch

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14
Q

What is the basic Pascal’s law formula for computing force, given pressure and area?

A

Force = Area x Pressure (FAP)

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15
Q

Are liquids compressible?

A

No, they are considered to be incompressible.

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16
Q

What is the definition of matter?

A

Any substance that occupies space, has mass, and is perceptible to the senses.

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17
Q

What are three states of matter?

A

Solid, liquid, gas

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18
Q

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

A

761 mph

19
Q

What types of matter are affected by thermal expansion?

A

Solids, liquids, and gasses

20
Q

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

A

Thrust, Drag, Lift, Weight

21
Q

What is the angle between the chord line of an airfoil and the direction of the relative wind called?

A

Angle of attack

22
Q

What causes an airplane wing to stall?

A

The separation of airflow across the top of the wing from the wings upper surface

23
Q

What function do wing mounted vortex generators serve?

A

Serve to delay or keep the airflow from separating from the upper surface of the wing during high-speed flight

24
Q

What effect do the lowering of flaps have on an airplane in flight?

A

Increased lift, decreased stall speed, and increased drag

25
Q

What change occurs in the flow of air through the main rotor system of a helicopter when transitioning from normal powered flight to autorotation?

A

It is reversed. In normal flight, air is drawn into the main rotor system from above and exhausted downward, During autorotation, airflow enters the rotor system from below as the helicopter descends.

26
Q

How does blade flapping help compensate for dissymmetry of lift in helicopter main rotor systems?

A

Blade flapping serves to increase the angle of attack on the retreating blade side of the rotor and decreases the angle of attack on the advancing blade side.

27
Q

What have physicists used in comparing the densities of all solids and liquids?

A

Water

28
Q

What is potential energy?

A

Stored energy

29
Q

What class lever is a seesaw?

A

1st class lever

30
Q

Name at least two types of stresses that may act on an aicraft

A

1) Strain
2) Torsion
3) Bending
4) Shear
5) Tension
6) Compression

31
Q

What term is used to describe the rate of speed and direction?

A

Velocity

32
Q

What is the name of a tube that converges to a smaller diameter and then diverges back to its original diameter and can be used to demonstrate Bernoulli’s Principle?

A

A Venturi

33
Q

When air or fluid pass through the middle section of a venturi, what pressure and velocity changes occur?

A

Velocity increases and pressure decreases

34
Q

What is the term used to describe the ratio of speed of an aircraft to the speed of sound?

A

Mach number

35
Q

Describe directional stability

A

The aircraft’s ability to not be adversely affected by a force around its vertical axis

36
Q

Describe longitudinal stability

A

The aircrafts ability to not be adversely affected by a force around its lateral axis creating a pitching type motion

37
Q

Describe lateral stability

A

The aircrafts ability to not be adversely affected by a force around its longitudinal axis creating a rolling type of motion

38
Q

What is the characteristic of wing design called that adds an upward lateral angle of a few degrees from horizontal?

A

Dihedral

39
Q

A wing design that incorporates a dihedral, gives an aircraft what type of stability in flight?

A

Lateral

40
Q

What type of wind is parallel and opposite to the direction of flight?

A

Relative wind

41
Q

What is the name of the imaginary line that runs from the leading edge to the trailing edge of an airfoil?

A

Chord Line

42
Q

What is the name of the angle between the chord line of a wing and the longitudinal axis?

A

Angle of Incidence

43
Q

Name at least 2 forms of energy that can be converted into heat energy

A

Mechanical, electrical, chemical, radiant, nuclear, the sun

44
Q

Name three temperature scales

A

1) Fahrenheit
2) Celsius
3) Kelvin
4) Rankine

My General Oral Questions (9 decks)

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