Physics GCSE
SI units and substitution
What SI units and substitution means in Physics GCSE, as defined for AQA.
Definition of SI units and substitution
Check what you remember
Read the wording for your board, then hide it and explain SI units and substitution in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Values are substituted with consistent SI units before calculating, such as m/s, m/s² and m.
Topics that use SI units and substitution
- Acceleration (AQA GCSE)
Related terms
- Acceleration
- Acceleration and units
- area under a graph
- Area under a graph as a physical quantity
- Average acceleration
- Change in velocity
- Compound geometric shapes in physics
- Direction convention
Using SI units and substitution in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics GCSE termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge