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Physics vocabulary · Experiments and Problem Solving

Line of best fit

Meaning in physics, with examples

nounCore term

In physics, line of best fit means: A straight line or smooth curve drawn on a graph so that it passes as close as possible to all the plotted points, showing the overall trend of the data.

In Turkish: en uygun doğru, en iyi uyum doğrusu

How it is used

Students draw it by eye or with software (least-squares fitting), then use its gradient and intercept to find physical quantities. Never just join the dots. Points far from the line may be anomalous results that need checking.

Example sentences

  1. Draw a line of best fit and use its gradient to find the spring constant.

  2. The line of best fit does not pass through the origin, which suggests a zero error.

Common collocations

  • draw a line of best fit
  • gradient of the line
  • y-intercept
  • anomalous result
  • curve of best fit
  • directly proportionalDescribes two quantities that change at the same rate, so that if one doubles the other doubles too. Their graph is a straight line through the origin.
  • systematic errorAn error that shifts every reading in the same direction by a similar amount, for example because of a badly calibrated instrument or a zero error. Repeating the measurement does not remove it.
  • uncertaintyThe range within which the true value of a measurement probably lies, written with a ± sign. It shows how reliable a measurement or result is.
  • inversely proportionalDescribes two quantities linked so that when one doubles, the other halves. Their product stays constant, and a graph of one against the other is a curve, not a straight line.

More terms: Experiments and Problem Solving

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