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# Rocketry Vocabulary

TermDefinition
Acceleration a change in velocity over an amount of time
Air Pressure the amount of force per unit area exerted by the molecules that make up air on trhe surfaces they bump into
Apogee the peak altitude of a model rocket
Body Tube a specially wound and treated cardboard or lightweight plastic cylinder used to make the fuselage of a model rocket
Drag resistance or friction force experienced by any object moving through air
Dynamic Equilibrium Equilibrium that occurs when an object is moving in a constant velocity and the net forces are equal to zero
Equilibrium A condition in which all influences acting cancel each other, so that a static or balanced situation results.
Fairing an external metal or plastic structure added to increase streamlining and reduce drag, especially on a high-performance car, motorcycle, boat, or aircraft.
Fin the stabilizing and guiding unit of a model rocket, an aerodynamic surface projecting from the rocket body for the purpose of giving the rocket directional stability.
Force something that causes a change in the motion of an object; any push or pull
Free Fall any motion of a body where gravity is the only force acting upon it
Gravity a force that pushes objects come down to the earth
Inertia the tendency of a body at rest to remain at rest or a body in motion to remain in motion, unless pushed or pulled by an unbalanced force
Lift the force that occurs when air moving over the top of a moving object travels faster than the air under it and uneven pressures are produced
Mass the measure of an object's resistance to acceleration (a change in its state of motion) when a net force is applied. It also determines the strength of its mutual gravitational attraction to other bodies. The basic SI unit of mass is the kilogram (kg).
Momentum the property of a moving object equal to its mass times its velocity
Newton's 1st Law An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Newton's 2nd Law The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Newton's 3rd Law For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.
Nosecone the foremost surface of a model rocket, generally tapered in shape to streamline it; usually made of balsa or lightweight plastic. Smoothes airflow around a rocket.
Propulsion a means of creating force leading to movement. The term is derived from two Latin words: pro, meaning before or forward; and pellere, meaning to drive.
Stability created by the center of gravity; allows for control
Static Equilibrium Equilibrium that occurs when an object is at rest or motion is unchanging and the net forces are equal to zero
Terminal Velocity The constant vertical velocity due to the forces of gravity being equal to the force of air resistance with the net force being equal to zero
Thrust The force of flight that pushes a plane forward.
Free Body Diagram diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation
Created by: SWMustangTeacher