Question

diferences between fundamental and dirived units

Answer 1

Fundamental Unit.

• Fundamental units are all those units which are independent of any other unit (including themselves).

• Fundamental units cannot be broken down into elementary level; in fact, these are elementary unites.

• Only seven fundamental units exist in SI system.

• Examples of fundamental units along with physical properties are:

Length (Meter, m)

Mass (Kilogram, kg)

Time (Second, s)

Temperature (Kelvin, K)

Derived Unit

• 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.

• Derived units can be broken down to its elementary level (composed of fundamental units).

• Derived units can be expressed in terms of fundamental units.

• A large number of derived units are available.

• 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.

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Answer 2

Fundamental quantities doesn't depend on other quantities . They are basic quantities like mass of an object.

While derived quantities depend on the fudamental quantities like mass ,length , time. For an example, the formula of density is mass by volume hence to calculate the density we have to the value of mass. Hence density is derived quantit

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