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Researching Physics: skills of scientific inquiry

Quick questions on Uncertainties in measurement: random, systematic, scale-reading and combining - SQA Higher Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?
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A digital ammeter reads 0.45 A0.45\ \text{A}, with the last digit in hundredths. State the scale-reading uncertainty. [1 mark]
What is q2?
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Five timings give a range of 0.20 s0.20\ \text{s} about a mean of 4.00 s4.00\ \text{s}. State the approximate random uncertainty in the mean. [1 mark]
What is q3?
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A speed is found from a distance measured to ±1%\pm 1\% and a time measured to ±5%\pm 5\%. Calculate the percentage uncertainty in the speed. [2 marks]

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