Edexcel A-Level Physics Use of Collected Data

Review use of collected data in Edexcel A-Level Physics through graphical methods, repeated measurements and tests of predicted relationships.

Exam points

plot transformed variables such as T² against h to test for a straight-line relationship
plan repeated measurements across several values before judging an experimental prediction

[Maximum number: 6]

A pendulum of length l swings in a vertical plane. The string hits a peg placed at a distance h vertically below the point of suspension as shown. This makes the pendulum shorter for part of its motion.

Figure for Question 6.3.7 - Use of collected data question 1 — Edexcel A-Level Physics A2

A student suggests that an approximate relationship between T and h is given by

$T^2=\dfrac{2\pi^2}{g}(2l-h)$

Devise a plan to test the validity of the relationship using a graphical method. Include the use of a stopwatch and any additional apparatus as required.

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6.3.7 - Use of collected data question 1