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Acceleration
Any change in the speed or direction of an object's motion.
Aerodynamic
Able to move through the air with as little air resistance as possible. Minimizing (making a small amount) of drag.
Air Resistance
The force that air exerts on any moving object.
Drag
Air resistance that opposes a vehicle's motion and slows it down.
Energy
The ability to do work.
Friction
The force caused by two objects rubbing together. The force that opposes (works against) motion.
Kinetic Energy
The energy an object has due to its motion.
Potential Energy
Stored energy that results from the position of an object.
Unbalanced Forces
Forces that are necessary for motion to occur. Think "Tug of War"- the side with the greater force will win.
Variable
Something that changes (the item that is tested) in an experiment.