Motion vocabulary
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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.  
distance  a change in position (how far an object has moved)  
instantaneous speed  speed at any given point.  
gravity  the force of attraction between objects. The larger the object the greater its gravitational pull. 
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Created by:
jsolari
on 20060605