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# Motion vocabulary

TermDefinition
speed the rate of motion of an object. It's calculated by dividing the distance traveled by the time
average speed the total distance traveled in the total amount of time it took to travel that distance; total distance/total time
constant speed when the speed of an object does not change throughout its time in motion.
velocity the speed and direction of an object.
acceleration rate of change in velocity; when an object changes its speed, direction, or both.
force a push or pull.
friction a force that acts in the opposite direction of motion.
unbalanced force a force that is unequal in size and is in the same direction as the motion of the object. When forces are unbalanced, there is a change in motion.
balanced forces When the total forces acting on an object are equal and opposite in direction. When forces are balances, no change in motion occurs.
motion a change in position compared to a reference point
instantaneous speed speed at any given point.
gravity the force of attraction between objects. The larger the object the greater its gravitational pull.
frame of reference (reference point) an object in motion has to be compared to a non-moving object
Created by: jsolari