Physics A-Level
Consistency of units and signs
What Consistency of units and signs means in Physics A-Level, as defined for AQA.
Definition of Consistency of units and signs
Check what you remember
Read the wording for your board, then hide it and explain Consistency of units and signs in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Velocities opposite to the chosen positive direction are negative, and masses and velocities are substituted with consistent units.
Topics that use Consistency of units and signs
- Momentum (AQA A-Level)
Related terms
- Algebraic modelling of collisions
- Area under a force–time graph
- Closed system
- Coalescence and explosions
- Conservation of linear momentum
- Elastic versus inelastic collisions
- Explosions as momentum-conserving separations
- Impulse
Using Consistency of units and signs in the exam
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