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# Vocab Words

### Science

TermDefinition
motion The state in which one object's distances from another is changing
reference point A place or object used for comparison to determine if an object is in motion
instantaneous speed The speed of an object at one instant time.
speed The distance an object travels per unit of time
velocity speed in a given direction
slope The steepness of a line on a graph.
acceleration The rate at which velocity changes
force A push or pull exerted on an object
unbalanced force Forces that produce a nonzero net force, which changes an objects motion
balanced force Equal forces acting on an object in opposite directions, not changing the motion of the object
newton A unti of measurement that equals the force required to accelerate one kilogram of mass at a meter per second per second. E=MC^2
net force The overall force on an object when the individual forces acting on it are added together.
friction The force that one surface exerts on another when the two surfaces are rubbed together.
static friction Friction that acts on objects that are not moving
gravity The force that PULLS objects toward each other
sliding friction Friction that occurs when one solid surface slides over another
rolling friction Friction that occurs when an object rolls over a surface
fluid friction Friction that occurs as an object moves through a liquid
air resistance The fluid friction experienced when objects fall through air
free fall The motion of a falling object when the only force acting on it is gravity
terminal velocity The greatest velocity a falling object can achieve
inertia The tendency in an object to resist any change in its motion
momentum the product of an objects mass and velocity
Law of Conservation of Momentum The rule that in the absence of outside forces the total momentum of objects that interact does not change.
average speed The overall rate of speed at which an object moves
Created by: declanb