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# Motion

### Vocabulary

TermDefinition
motion the state in which one object's distance from another is changing
reference point a place or object used for comparison to determine if an object is in motion
relative motion whether or not a n object is in motion depends on the reference point you choose
meter the basic SI unit of length (a little longer than a yard)
speed the distance an object travels per unit of time
average speed the overall rate of speed at which an object moves calculated by dividing the total distance by the total time
formula for speed speed = distance/time
force a push or a pull exerted on an object
newton the SI unit for force
net force the overall force on an object when all of the individual forces acting on it are added together
centripetal force a force that causes an object to move in a circle
balanced forces equal forces acting on an object in opposite directions
unbalanced forces forces that produce a nonzero net force which causes an object's motion
friction the force that one surface exerts on another when the two surfaces rub against each other
sliding friction friction that occurs when one solid surface slides over another
rolling friction friction that occurs wen an object rolls over a surface
static friction friction that acts on objects that are not moving
fluid friction friction that occurs as an object moves through a fluid
mass the amount of matter in an object
weight the force of gravity on an object
gravity the force that pulls objects toward each other
Law of Universal Gravitation Gravity increases with mass and decreases with distance
Created by: sbraniecki