Choose a guide below.
Source: DSKP KSSM Physics Form 4 and 5 (Versi English) (Bahagian Pembangunan Kurikulum (BPK), KPM)
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Choosing the axes
By convention the manipulated variable goes on the horizontal x-axis and the responding va
Choosing a scale
Choose a simple, even scale that spreads the data across more than half the grid. Awkward
Plotting points accurately
Plot each point with a small, sharp cross or dot, positioned to within half a small square
Drawing the best-fit line
A best-fit line passes through the trend of the points with roughly equal numbers above an
Finding the gradient
The gradient is the change in y divided by the change in x, read from two well-separated p
Gradient with units
The unit of a gradient is the y-axis unit divided by the x-axis unit. Stating it correctly
Reading the y-intercept
The y-intercept is the value of y where the best-fit line crosses the y-axis at x equals z
Extrapolation
Extrapolation extends the best-fit line beyond the measured data to estimate a value. Use
Reading values from a graph
To read a value within the data range, use the best-fit line, not the scattered points. Dr
Direct proportion
Two quantities are directly proportional when their graph is a straight line through the o
Inverse proportion
Two quantities are inversely proportional when their product is constant, giving a curved
Common graph mark losses
Most graph marks are lost to a short list of avoidable slips: unlabelled axes, awkward sca