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FS Lesson 2

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Acceleration
The rate of change of velocity with respect to time.
Aileron
The controlling surface that regulates an aircraft's roll.
Airfoil
A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.
Angle of Attack
The acute angle between the direction of the relative wind and the chord of an airfoil.
Aspect Ratio
The ratio between the wingspan and average chord of a wing.
Bernoulli's Principle
As the speed of a fluid increases, its pressure decreases.
Camber
A measure of the curvature of the airfoil.
Chord
The width of an airfoil or wing.
Dihedral Angle
The angle between an aircraft wing and a horizontal line.
Drag
Resistance of the air (technically a fluid) against the forward movement of an airplane.
Elevator
The controlling surface that regulates an aircraft's pitch.
Empennage
The tail assembly of an aircraft, including the horizontal and vertical stabilizers, elevators, and rudder.
Flaps
Control surfaces attached to the trailing edge of the wing extending outward from the fuselage to the midpoint of each wing. Flaps can increase the lifting efficiency of the wing and decrease stall speed.
Fluid
A gas or liquid that tends to take the shape of its container.
Force
Transferring of energy to an object, typically by pushing or pulling on that object.
Fuselage
The central body of an aircraft where wings and stabilizers are attached.
Glider
An airplane with no attached source of thrust.
Gravity
The force that attracts a body toward the center of the earth or toward any other physical body having mass.
Heavier-Than-Air
An aircraft of greater weight than the air displaced.
Horizontal Stabilizer
An airfoil (usually at the back of an airplane) that resists up and down changes in motion.
Hypersonic
Relates to speed five or more times that of sound in air.
Leading Edge
The front, usually rounded, edge of an airplane wing or airfoil.
Lift
The force that directly opposes the weight of an airplane and holds the airplane in the air.
Lighter-Than-Air
An aircraft of less weight than the air displaced.
Mach 1
760 MPH. When a plane travels faster than this speed, it is breaking the sound barrier.
Mass
The quantity of matter, which a material contains.
Newton's 1st Law
Objects at rest stay at rest and objects in motion stay in motion unless an external force is applied. It is known as the law of inertia.
Newton's 2nd Law
The relationship among an object's mass (m), acceleration (a), and an applied force (F), is Force equals mass times acceleration (F= ma).
Newton's 3rd Law
For every action there is an equal and opposition reaction.
Pitch
The up or down movement of an aircraft.
Precise Input
A method of placing geometric entities at precise x and y coordinates on a plane.
Propellant
A chemical mixture that is burned to produce thrust.
Propeller
An airfoil mounted on a revolving shaft. It creates low pressure in front of it, thereby moving an aircraft forward because of the high pressure area behind the propeller.
Propulsion
The means by which aircraft and spacecraft are moved forward. It is a combination of factors such as thrust (forward push), lift (upward push), drag (backward pull) and weight (downward pull).
Ramjet
An engine that can operate only when moving at high speed since it has no moving parts and no device for drawing in air.
Rocket Engine
An engine that produces thrust by expelling hot gases from a rear nozzle.
Roll
The clockwise or counterclockwise rotating motion of an aircraft.
Rudder
A controlling surface on an aircraft's tail that regulates yaw.
Slats
Protrusions from the leading edge of a wing that, when combined with the flaps, result in a significant increase in lift.
Spoiler
Device used to destroy lift. Found on top of the wing and in varying sizes.
Thrust
A force applied to a body to propel it in a desired direction. The force which moves an aircraft through the air.
Trailing Edge
The rear edge of a wing.
Turbine
A rotary engine that extracts energy from fluid turning blades.
Vertical Stabilizer
A vertically oriented airfoil at the back of an airplane that resists left and right movements.
Velocity
A vector quantity that includes the speed and direction of an object.
Weight
The force generated by the gravitational attraction of the earth on the airplane. Lift must be equal to weight in order to sustain flight.
Wing
The major horizontal surface on an airplane that provides lift.
Yaw
A side-to-side motion of the nose of the aircraft.