Scalar — Science definition
Defined in 2 courses:
- A quantity with magnitude only. (Physics & Environmental Science)
- A quantity with magnitude only, such as distance, speed, time, or mass. (Physics & Environmental Science)
Where it is taught
- Vectors, Components & Trigonometry — Measurement & Vector Foundations, Physics & Environmental Science, Grade 12
- Describing Motion — Motion & Kinematics, Physics & Environmental Science, Grade 12
In use
A scalar has magnitude only; a vector has magnitude and direction.
Vectors, Components & Trigonometry
A scalar has size only — distance, speed, time, temperature, and mass are all scalars, fully described by a number and a unit.
Describing Motion
Questions using scalar
Problem 1
Explain the difference between a scalar and a vector, giving one example of each.
Answer and explanation
A scalar has magnitude only — for example, a distance of 10 m or a speed of 5 m/s. A vector has both magnitude and direction — for example, a displacement of 10 m east or a velocity of 5 m/s north. Vectors need the direction stated to be fully described, and they combine using vector rules rather than simple addition.