Scalar and vector quantities — AQA GCSE Physics
Test yourself on Scalar and vector quantities with AQA GCSE practice questions.
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Scalar and vector quantities explained
A scalar quantity is completely described by a number and a unit, its magnitude, with no direction attached.
Read the full explanation
Distance, speed, mass, energy, time and temperature are all scalars. Because there is no direction, scalars of the same kind add as ordinary numbers, so walking 3 km then 4 km always totals 7 km of distance however the route bends. Some kinematic scalars have a vector partner that does carry direction: distance pairs with displacement, and speed with velocity. However, scalars like mass, time, and temperature have no vector counterpart. This distinction is often examined when comparing a winding route between two towns to a straight line.
Your focus
- Classify a list of quantities as scalar or vector and give a reason for each decision.
- Explain why the distance travelled between two towns differs from the displacement.
- Name the vector partner of specific kinematic scalars like distance or speed.
Scalar and vector quantities exam tips
Marking Points
- one mark for defining a scalar as having magnitude only, with no direction
- one mark for a correct example, such as distance, speed, mass, energy or temperature
- one mark for stating that scalars of the same type add as ordinary numbers
- one mark for correctly pairing a kinematic scalar with its vector partner, such as distance with displacement
Examiner Tips
- 💡Learn the specific scalar-vector pairs like distance with displacement and speed with velocity, as these are examined most.
- 💡Use the exact phrase 'magnitude only', which is the wording the mark scheme accepts.
Common Mistakes
- calling weight a scalar, when it is a force and therefore a vector
- claiming every scalar has a vector partner, forgetting that mass, time, and temperature do not
- listing velocity, force or acceleration among the scalars