Transcription of Uncertainties and practical work - Edexcel
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Uncertainties and practical work - Edexcel
Uncertainties and practical work The aim of physics in studying natural phenomena is to develop explanations based on empirical evidence. Hence there is a central concern about the quality of evidence and of the explanations that are based on it. This involves an appreciation of the causes of Uncertainties that can arise in practical work and how they should be dealt with, both in planning an experiment to minimise these Uncertainties and in forming a valid conclusion. There is no practical examination in this qualification and a set of practical skills has been identified as appropriate for indirect assessment. practical skills should be developed by carrying out practical work throughout the course, for example by carrying out the Core Practicals listed in the Specification. The assessment of these skills will be through examination questions, in particular for Unit 3: practical Skills in Physics I and Unit 6: practical Skills in Physics II.
Note that this is to 2 sf since the measurements are to 2 sf. The percentage uncertainty in the area of the square tile is calculated by multiplying the percentage uncertainty in the length by 2. Percentage uncertainty in A = 2 × 0.6% = 1.2% Therefore the uncertainty in A = 7100 × 1.2% = 85 mm2 So A = 7100 mm2 ± 1.2% or A = 7100 mm2 ± 85 mm2 b.
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