Physical and Fundamental quantity
A quantity that can be measured is called a physical quantity. Fundamental quantities are those which cannot be expressed or measured in terms of other physical quantities.
Scalar and Vector quantity
Physical quantities which have magnitude only and no direction are called scalar quantity. Physical quantities that have magnitude and direction both and which obey triangle law are called vector quantities.
- Scalar quantity (only magnitude and no direction) Examples : Distance, Speed, Time, Mass, Volume, Density, Pressure, Temperature, Energy.
- Vector quantity (both direction and magnitude) Examples : Displacement, Velocity (m/s²), Acceleration (m/s²), Momentum, Linear momentum, Force, Electric field, Polarization, Impluse (Ns).
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