Derived Quantities and Units

DERIVED QUANTITIES AND UNITS.

Q. What is DERIVED QUANTITIES AND UNITS?

Ans. a) In physics, we come across a large number of quantities like speed, momentum, resistance, conductivity, etc. which depend on some or all of the seven FUNDAMENTAL QUANTITIES and can be expressed in terms of the FUNDAMENTAL QUANTITIES, are called derived units.

 ForExample,

1) SI unit of velocity

          = Unit of displacement/Unit of time
          = m/s
        =m s^-1
 

 2) Unit of momentum= (Unit of mass) X (Unit of velocity)

                                       = kg m/s

                                       = kg m s^-2

The above two units are derived units.