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Cambridge AS & A Level Physics

1.2SI units

SI units in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic23 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 1.2.1Recall the SI base quantities and units: kg, m, s, A and K.
  2. 1.2.2Write derived units as products or quotients of base units and use them.
  3. 1.2.3Use base units to check whether a physical equation is homogeneous.
  4. 1.2.4Recall and use the prefixes from pico to tera.

Lessons

  • SI base units, prefixes and homogeneous equations

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

SI units: sample question

1 mark

What is the joule expressed in SI base units?

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Turn SI units into a strength.

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