here is a sweet summary of 1st chapter of fundamental of physics by halliday,resnick and krane. it cover each topic of that chapter . i have explained in a very simple way that's very easy to understand.
, ROLE OF PHYSICS IN
MEASUREMENTS
Science and engineering based on measurement and
comparisons. Thus ,we need rules about how things are measured
and compared. And we need experiments to establish the units
for those measurements and comparisons.
The purpose of physics is to design and conduct those
experiments.
, Measuring
things
We measure each quantity once, we have setup a
standard –say for length - we
by its own unit , by
must work out procedure by
comparison with a standard . which any length can be
A unit is a unique name we expressed in terms of that
assign to measure of that standards. Rulers ,which
quantity . For approximate our length
example :meter for the standard ,give us one such
quantity of length. the procedure for measuring
standard corresponds to length but we cannot measure
every length with ruler e.g.;
exactly one unit of the
radius of atom
quantity.
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