Expressing Quantities & SI UnitsEdexcel GCSE Physics: Flashcards

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What is an SI unit?

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What is an SI unit?: An internationally agreed standard unit used to measure a physical quantity, allowing measurements to be compared consistently.
What multiplier does the prefix 'kilo' (k) represent?: ×10³ (1000).
What multiplier does the prefix 'milli' (m) represent?: ×10⁻³ (0.001).
What multiplier does the prefix 'micro' (µ) represent?: ×10⁻⁶ (0.000001).
What multiplier does the prefix 'nano' (n) represent?: ×10⁻⁹.
What multiplier does the prefix 'mega' (M) represent?: ×10⁶ (1,000,000).
What multiplier does the prefix 'giga' (G) represent?: ×10⁹.
What multiplier does the prefix 'centi' (c) represent?: ×10⁻² (0.01).
How many seconds are there in 1 hour?: 3600 seconds (60 minutes × 60 seconds).
Convert 2 hours into seconds.: 2 × 3600 = 7200 seconds.
Write 45,000,000 in standard form.: 4.5 × 10⁷.
What is the rule for the value 'A' in standard form A × 10ⁿ?: 1 ≤ A < 10.
Why is it important to state units with numerical answers in physics?: Without the correct unit, an answer is incomplete and marks are typically lost, even if the number itself is correct.