Edexcel A-Level Physics Percentage Uncertainty

Review percentage uncertainty in Edexcel A-Level Physics through half-range calculations, repeated readings, mean values and timing uncertainties.

Exam points

calculate percentage uncertainty in a mean using half the range or furthest-from-mean value
find uncertainty in seconds or metres before converting it to a percentage of the mean
explain why timing multiple oscillations reduces percentage uncertainty in the period

[Maximum number: 2]

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

Figure for Question 6.5.11 - Percentage uncertainty 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.

Determine the percentage uncertainty in the mean value of T.

Percentage uncertainty =

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6.5.11 - Percentage uncertainty question 1