Rev. Notes > AS > Physical quantities and units Previous Topic Physical quantities and units Next Topic Topics
 Physics Areas of Physics Interdisciplanary areas of physics Quantities in Physics Base Units Convention for indicating units Derived Units S.I. Units (International System of Units) Supplementary units Homogeneity of equations Significant figures Rules of Significant figures Further discussion on Significant figures Dimensions Scientific notation The Avogadro's Constant Scalars and Vectors Addition and subtraction of co-planar vectors Rectangular components of a vector

## Scalars and Vectors

Scalars: Scalar quantities have magnitude only.

Vectors: Vector quantities have both magnitude and directions.

Example of each type of quantity are given in table below.

 Scalars Vectors Distance Speed Mass Energy (work) Volume charge Displacement Velocity Force (weight) Acceleration Momentum Torque

Two vector quantities are equal only if they have the same magnitude and same direction.

Vectors can be represented by a line drawn in a particular direction. The length of the line represents the magnitude of the vector; the direction of the line represents the direction of the vector.

In print, vector quantities are indicated by using bold type (e.g. F) or by using an arrow (e.g. F). The same symbol without the use of either bold type or an arrow (e.g. F) represents the magnitude of the vector.

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