Edexcel A-Level Physics Handling Data

Review handling data in Edexcel A-Level Physics through repeated measurements, significant figures, mean values and combined measurement uncertainty.

Exam points

calculate means from repeated readings, then round values to the precision shown by the raw data
combine absolute and percentage uncertainties when measurements are subtracted, multiplied or powered
assess the largest source of uncertainty before comparing calculated ranges with physical conclusions

Covered syllabus points

C.1.1—Significant figures C.1.2—Arithmetic means C.1.3—Simple probability C.1.4—Order-of-magnitude calculations C.1.5—Combined measurement uncertainty

[Maximum number: 2]

A student investigated the properties of a spring using the apparatus shown.

Figure for Question C.1 Handling data question 1 — Edexcel A-Level Physics A2

The student determined the time period T of the oscillations of the mass-spring system.

The student displaced the mass downwards. He released the mass so that the mass oscillated vertically. He used a stopwatch to measure the time for multiple oscillations.

The student recorded the following results.

Table for Question C.1 Handling data question 1 — Edexcel A-Level Physics A2

Calculate the mean value of T.

Mean value of T =

[Maximum number: 2]

An L-shaped steel rod was held horizontally in a stand clamped by its shorter end as shown.

The end of the steel rod was at a height p above the bench. A student attached a mass m to the end of the steel rod causing it to bend towards the bench. The end of the steel rod was then at a height q above the bench.

Figure for Question C.1 Handling data question 2 — Edexcel A-Level Physics A2

The difference between p and q was recorded as 26 mm ± 1 mm.

Explain why the uncertainty in this value is given as 1 mm.

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Covered syllabus points

C.1 Handling data question 1

C.1 Handling data question 2