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10 cards from this deck
Rate of change
y-axis units per x-axis units
change in ychange in x\frac{\text{change in y}}{\text{change in x}}change in xchange in y
Speed (metres per second)
Draw straight line between 2 points, calculate gradient
Straight line touching curve at exactly one point
Draw tangent at point, calculate its gradient
Instantaneous rate at that point
Straight line: average rate; Tangent: rate at point
Must make physical sense for measurement
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