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GCSE Physics units and standard form

Convert metric prefixes, grams and squared or cubed units; write numbers in standard form.

Practise

SI unit for mass

A small object has mass 3.2 g. Express this in the SI base unit for mass.

Use decimals or e notation, e.g. 4.2e-3. Enter the unit separately.

Hint

The SI base unit of mass is kg. 1 g = 10-3 kg.

Worked solution
  1. 1 g = 10-3 kg.
  2. 3.2 g = 3.2 × 10-3 kg = 3.2 × 10-3 kg.
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Question type: Mixed practice
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Foundation and Higher: this set covers content common to both tiers. Some calculations need several steps.

Units and powers

This set uses nano, micro, milli, centi, kilo and mega. A prefix on a squared or cubed length applies to every length factor: 1 cm³ = (0.01 m)³. The SI base unit for mass is kg. Standard form has a coefficient from 1 inclusive to 10 exclusive.

GCSE scope

AQA 8463: MS 1a–b, 3c, 5c; 4.2.1.3; OCR Gateway J249: 5e Units; 5g M1a–b, M3c, M5c; P3.2. Tasks cover the selected skills listed above.

AQA specification · OCR Gateway specification

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