The information must be given on the axis label or in the title of the graph.
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it is less dense
You can use a line graph if your measuring the motion in separate experiments or comparing.
A bar graph is for measuring discontinuous data, for example 'What colour eyes do people in this room have'? This would be a bar chart (number on the y axis and eye colours on the x)A line graph is for measuring continuous data, like temperature, for example.
a line graph is over time. a bar graph is not
A cluster in a line graph is the major part of the line graph that connects to the plot.