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23 Cards in this Set
- Front
- Back
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Mass |
the quantity of matter which an object contains. Units: kilogram, slugs, pound-mass |
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Volume |
The amount of space occupied by an object. Units: cubic feet, gallons, cubic meters, liters |
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Density |
Mass per unit of volume. Units: slugs or pound mass per cubic foot, kilograms per cubic meter |
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Speed |
the rate of change in position of an object. Units: knots, ft/sec, km/ hr |
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Knots |
Nautical miles per hour. 1 nautical mile is approx. 6076 ft or 1.15 statute miles. 100 knots = 115 mph |
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Velocity |
The speed and direction of an object's motion |
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Force |
A push or pull exerted on an object. Units: pounds or Newtons |
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Weight |
force applied to mass due to gravitational pull not to be confused with load factor or G-load. Weight force stays the same for an aircraft no matter how many g's the aircraft encounters during maneuvers |
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Moment |
A rotational force applied a distance from an axis of fulcrum. Units: pound foot, newton-meter |
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Work |
A force applied over a distance. Unit: pound-feet, neeton-meter |
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Power |
Work done per unit of time or a force times a velocity. Units: horsepower, pound-feet per second, newton meters per second |
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Potential Energy |
The ability to do work due to position (mostly due to altitude). P.e.= weight times height |
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Kinetic Energy |
the ability to do work due to motion. K.E.= 1/2 mV^2 |
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Total Energy |
Sum of all kinetic and potential energy |
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Air Density (p) |
Mass of air particles per unit volume. decreases with altitude gain. |
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Air temperature |
average kinetic energy of the air particles. decreases at an average rate of 2C for every 1000 ft of altitude gained on a standard day in the troposphere |
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Static Pressure |
Measurement of the weight of an air column over a specific area. also the pressure measured perpendicular to an airflow e.g. at the static port. measured in PSI, inches of mercury, or millibars |
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Dynamic Pressure (q) |
measure of the impact pressure exerted by a moving stream of air molecules. Increases with the square of the velocity. q=1/2 pV^2 |
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Standard Day |
A sea level pressure of 29.92 inches of mercury, 15°C (59°F) |
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Standard Datum Plane |
Elevation at which barometric pressure equals 29.92 inches of mercury . on a standard day, that is at sea level, but it will move above it below that depending on the changes in atmospheric pressure |
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True altitude |
The actual height above mean sea level (MSL) |
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Pressure Altitude |
The height above a standard datum plane. The altimeter indicates pressure altitude if the Kollsman window is set to 29.92. Pressure altitude has an inverse relationship with pressure, i.e. when pressure altitude increases, air pressure decreases |
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Density Altitude |
Pressure altitude corrected for temperature deviations from standard. Used as an index for guaging aircraft performance. very hot or cold temps have a large effect on density altitude. Density altitude has an inverse relationship with density, i.e. when density altitude increases, air density decreases and vice versa |
