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IB Physics SL S2.2.3 Data Quality Questions

Assess SL data quality by identifying systematic error, estimating gradient uncertainty and explaining why repeated measurements improve precision.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • identify systematic error from a non-zero intercept or a consistent displacement of data and error bars
  • compare maximum and minimum gradient lines to assess uncertainty in a gradient
  • explain that repeating measurements reduces random error and improves precision rather than removing systematic error

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Study S2.2.3—Data quality conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics SL S2.2.3 Data Quality Questions question 1

[Maximum number: 1]

A group of students uses pressurized air to move a piston that forces a nail into a block of wood. A gauge is used to measure the pressure P of compressed air above atmospheric pressure. The nail enters the wood perpendicular to its surface.

Figure for Question IB Physics SL S2.2.3 Data Quality Questions question 1 — IB Physics SL

The students use a ruler to measure the length of the nail which remains above the surface of the wood as shown. The depth of the nail inside the wood is d. All necessary length measurements are recorded using a ruler with uncertainty ±1 mm\pm 1 \mathrm{~mm}.

Figure for Question IB Physics SL S2.2.3 Data Quality Questions question 1 — IB Physics SL

The students collect only one value of d for each value of P. Suggest why this is a poor method.

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