Net Force, The overall force on an object when all the individual force acting on it are added together, Newtons , A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second  , Newton's first law , An object at rest will remain at rest, and an object in motion will remain in motion at a constant speed and direction, unless acted upon by a net external force, Newton's second law , The acceleration of an object is directly proportional to the net Force acting on it and inversely proportional to its mass, Newton's third law, For every action in nature there is an equal and opposite reaction, Reference Point , A place or object used for comparison to decide whether an object is in motion, Speed, The distance an object travels per unit of time, Velocity , Speed in a given direction, Wreck , Force exerted on an object that causes it to move, Acceleration, The rate at which velocity changes, Action Force, The initial push or pull exerted by one object on another, Air Resistance, A type of frictional force exerted by air molecules against an object moving through them, Lubricant, the study of substances introduced between moving surfaces to reduce friction wear and heat generation, Reaction force , An equal and opposite force exerted by a second object in a response to a force applied by a first object, Drag, A force acting opposite to the relative motion of any object moving with a respect to a surrounding fluid, Energy , The ability to do work or cause damage, Kinetic energy, Energy than object has due to its motion, Potential Energy, the energy an object has because of its position also the internal energy of an object such as energy stored in chemical bonds, Balanced force, If 2 forces action on and object are equal in strength and opposite in direction, Unbalanced force, When a pull or push is not equal in strength or fit it is stronger than the friction, Mass , A measure of how much matter is in an object, Force , A push or pull exerted on an object, Motion, The state in which one object's distance from another is changing, Friction, The force that two surfaces exert on each other when they rub against each other , Gravity, The attractive force between objects the force that moves objects downhill.

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