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# Physical Science

### Chpt 4 vocab for final

TermDefinition
Scalar Any measurable quantity that can be completely described with a single piece of info (#/unit)
Vector A measurable quantity that has both a magnitude (#/unit) and a direction
Accelerated Reference Frame the reference frame accelerates with the system
Rotational Reference Frame the reference frame accelerates, but the system is stationary
Fixed Frame of Reference the reference frame is stationary, but the system accelerates
Motion a change of position during a time interval
Coordinate Axis also known as the number line
Time the non-physical continuum that order the sequence of events
Speed the rate at which an object changes position
Velocity a vector measurement because it includes how fast and which direction
Acceleration the rate of change of the speed or velocity during a given time interval
Distance a positive scalar quantity that indicates how far an object has traveled during a time interval
Displacement the OVERALL change in position during a time interval
Galileo said we must first understand HOW objects move
Aristotle said we must first understand WHY objects move
System an artificial boundary used to isolate an object or objects
Surroundings everything outside the system
Boundary defines the limits of the system
Mechanics the study of motion
Deceleration a decrease in velocity in a period of time (slowing down)
Created by: Giraffe Girl