We are dealing with the basics of concepts units and dimensions in a video lesson. Physical quantity is a way of understanding nature and its physics applications and to measure them, we use units.
Introduction to Units
Physical quantities are helpful in
understanding the nature in terms of measurement. We try to understand the
world around us with minimum physical quantities and they are the alphabets and
words of the physics language. If a physical quantity is independent of any
other physical quantities, they are called fundamental physical quantities and
they are the irreducible set of quantities to represent other things in the
nature around. Length, mass and time are basic examples of fundamental physical
quantities.
Other physical quantities are derived basing on this fundamental
quantities and they are called derived physical quantities. Velocity,
acceleration and force are the some of the examples of derived physical
quantities. To measure this physical quantities, we need to use units. Unit is
a way of measuring the physical quantities in a standard way that is acceptable
to all.
As physical quantities are of two
types, the units are also two types and they are fundamental and derived units.
To measure the fundamental physical quantities, we have fundamental units with
different kinds of systems like FPS,CGS,MKS and SI system of units. We can
further define and write units for the derived quantities based on the the
fundamental system of units. At present we are using SI system as the standard
system to measure the fundamental physical quantities.
Introduction to Dimensions
Each physical quantity is either a
fundamental or derived physical quantity. Derived physical quantity is obtained
from fundamental quantity by manipulating the fundamental quantities as per the
requirement of the concepts and applications. The representation of a physical
quantity in terms of fundamental quantities is called dimensional formula and
the powers to which the fundamental quantities are raised are called
dimensions. Thus using the dimensional formula, we will be knowing the content
of fundamental quantities in it.
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Units and Dimensions Problems and Solutions One
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