To describe the motion of a particle along a straight line, it is often
convenient to draw a graph representing the position of the particle at
different times. this type of graph is usually referred to as an x vs. t
graph. to draw such a graph, choose an axis system in which time t is
plotted on the horizontal axis and position r on the vertical axis. then,
indicate the values of 2 at various times t. mathematically, this
corresponds to plotting the variable x as a function of t. an example of a
graph of position as a function of time for a particle traveling along a
straight line is shown below. note that an x vs. t graph like this does not
represent the path of the particle in space
xwe