19 terms

# chapter 2 vocab physics

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average speed
how fast an object is moving, is the absolute value of the slope of an object's position-time graph
average velocity
the change in position, divided by the time during which the change occured, is the slope of an object's position-time graph
constant velocity
a speed that does not change how fast it is, or the direction that it is in
coordinate system
a system used to describe motion that gives the zero point location of the variable being studied and the direction in which the values of the variable increase
displacement
a change in position having both magnitude and direction; is equal to the final position minus the initial position
distance
a scalar quantity that describes how far an object is from the origin
instantaneous position
the position of an object at any particular instant in time
instantaneous velocity
a measure of motion that tells the speed and direction of an object at a specific instant in time
magnitude
measure of size
motion diagram
a series of images showing the positions of a moving object taken at regular (equal) time intervals
origin
the point at which both variables in a coordinate system have the value zero
particle model
a simplified version of a motion diagram in which the moving object is replaced by a series of single points
position
the separation between an object and the origin; it can be either positive or negative
position vs. time graph
a graph that can be used to determine an object's velocity and position, as well as where and when two objects meet, by plotting the time data on a horrizontal axis and the position data on a vertical axis
scalar quantity
such as temperature or distance, that are just numbers without any direction
slope of a position vs. time graph
indicates both the magnitude and direction, indicates the average velocity of the object and not its speed
speed
relative rapidly in moving, going, etc. rate of motion or progress (distance/time)
time interval
the difference between two times
vector quantity
such as position, that have both magnitude and direction