A physical quantity represents any property that can be measured by a scientific device and technique, and given a numerical value.
Classification of quantities
Physical quantities
Classification of quantities
Physical quantities
- Base quantities
- Base quantities cannot be expressed in terms of other physical quantities while derived quantities are combination of two or more base quantities.
- The five base quantities are current, length, mass, temperature and time.
- Derived quantities
- Derived quantities result from the combination of base quantities through multiplication and divisive operations only.
- Mathematical operations like subtraction and addition are not involved.
Eg: Work is a derived quantity because it is obtained through the combination of three base quantities - mass, length and time.
Work = Force x Displacement
Work = Mass x Acceleration x Displacement
Work = (Mass x Velocity x Displacement) / Time
Work = [Mass x (Displacement)2] / (Time)2
Note: Displacement is measured in terms of length.
- Scalar quantities
- Scalar quantities describe only the magnitude of physical quantities.
- Scalar quantities describe only the magnitude of physical quantities.
- Vector quantities
- Vector quantities describe both the magnitude and direction of physical quantities.
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