Question

difference between fundamental unit and derived unit

Answer 1

Fundamental units are the physical units that cannot be derived from any other units. Example: Length, Mass, Time etc. You cannot derive them from other quantities.

 

Derived units are the units that can be derived from fundamental units. Example: Unit of speed is a derived unit. It can be derived from fundament units of length and time.

Answer 2

Fundamental Unit Derived Unit

Fundamental units are all those units which are independent of any other unit (including themselves). Derived units are all those units which are obtained by multiplying and/or dividing one or more fundamental units with or without introducing any other numerical factor.

Fundamental units cannot be broken down into elementary level; in fact, these are elementary unites. Derived units can be broken down to its elementary level (composed of fundamental units).

Fundamental units cannot be expressed in terms of derived units. Derived units can be expressed in terms of fundamental units.

Only seven fundamental units exist in SI system. A large number of derived units are available.

Examples of fundamental units along with physical properties are:

Length (Meter, m)

Mass (Kilogram, kg)

Time (Second, s)

Temperature (Kelvin, K)

Amount of substance (Mole, mol)

Electric current (Ampere, A)

Luminous intensity (Candela, cd)

Examples of derived units:

Velocity (m/s)

Acceleration (m2/s)

Momentum (kg-m/s)

Force (N)

Density (kg/m3)

Heat (J)

Energy (J)

Power (W), etc.