lesson
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Imagine tracking a battery-powered rover across a physics lab using a stopwatch and a meter stick. A table of raw numbers tells you where it was at each second, but plotting that data into a graph instantly reveals whether it was cruising at constant speed, speeding up, or standing still.
To turn those raw measurements into a clear motion graph, we first need to decide which measurement controls which axis.
Axis Conventions and Labelling
Following standard axis conventions, the independent variable (time t) is plotted on the horizontal x-axis, while the dependent variable (distance d) is plotted on the vertical y-axis.
Standard axis conventions require every axis to include the quantity name and unit, formatted clearly (e.g., Time / s or Distance / m).
📊Interactive diagram
How do you number your grid lines so your graph is easy to read and fills the page?
The Linear Scaling Rule
According to the Linear Scaling Rule, axis scales must be strictly linear, regular, and sensible (going up in multiples of 1, 2, 5, or 10). Never copy raw data values directly onto tick marks.
To ensure readability, plotted points must occupy more than 50% of the available grid space in both the horizontal and vertical dimensions.
📊Interactive diagram
With our grid numbered, how do we place each coordinate with maximum precision?