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Physical Science
Chpt 4 vocab for final
Term | Definition |
---|---|
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) |