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2 Foundations of physics

Quick questions on Measurements and uncertainties: errors, precision and combining uncertainties - OCR A-Level Physics A

4short 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 quantifying uncertainty?
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The percentage uncertainty is the most useful form because the rules for combining uncertainties through a calculation are stated in terms of percentages.
What is q1?
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Distinguish between precision and accuracy. [2 marks]
What is q2?
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A length is (2.00±0.05) m(2.00 \pm 0.05)\ \text{m}. State its percentage uncertainty. [1 mark]
What is q3?
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A quantity Q=ab2Q = ab^2. The percentage uncertainties are 3%3\% in aa and 2%2\% in bb. Find the percentage uncertainty in QQ.

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