# How to plot a good graph

How to plot a good graph for Physics SPA

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### How to plot a good graph

• 2. Characteristics  Remember the acronym SLAP Scale Line Axis Points
• 3. Scale   First and last points to cover more than half the graph paper in both directions unless prevented by certain conditions specified in the question Avoid awkward scales e.g. 2 cm is used to represent 3 units making it impossible to read each small square accurately.  Recommended scale – 2 cm to represent 1, 2, 5 units of the variable (or 0.1, 20, 500 etc).  show the area covered by 1st and last points and indicate at least 6 squares vertically and at least 5 squares horizontally
• 5. Line  Use sharp pencil to draw thin, neat and smooth line or curve. Best fit straight line or curve means Passing through as many points as possible. Equal points are on either side of line, for points that do not pass through the line.  No point is too far from line or curve. (Except anomalous points)
• 6. Line  Extend line beyond first and last points and the line should be as long as possible. Use a 30-cm long ruler for practical to draw straight line.
• 7. Axis  Axes are correctly labelled with correct physical quantities and units (in solidus notation). Use more markings to prevent wrong reading of scale. Plot a graph of Variable 1 (Vertical Axis) against Variable 2 (Horizontal Axis)
• 8. Points  Mark the data points clearly with neat thin small crosses. Points must be plotted according to the values in the table. Read the scales carefully.
• 11. Gradient  The triangle used should cover at least half of the line drawn. The triangle should be drawn in dotted line and do not mark the points used with crosses. Indicate the coordinates to be used. The coordinates must be on the line.
• 12. Gradient  Do not use plotted/ data points to calculate gradient. Use other coordinates. Show complete working as to how gradient is obtained. Values read from graph should be according to the number of decimal places of the scales used.
• 13. Example  (no units for gradient, but units required for R)
• 14. Example  Gradient = 1.60 Using y = mx + c, and the coordinates (0.35, 0.75), 0.75 = (1.60)(0.35) + c c = 0.19
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