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1. Physics – Chapter 1
Unit and Measurement

2. Physics and measurement
 Physics attempts to describe nature in an
objective way through measurement
 Measurement are expressed in units;
Officially accepted unit are called standard
unit
 Major systems of unit:
 Metric cgs system – centimeter, gram, second
 British (used by the U.S.) – feet, pound,
second

3. Basic units and quantity
 Length, mass and time are the fundamental
quantities; combination of them will form all
the other unit.
 Today the most important system is the
Système International (SI), which also based
on the metric system – meter, kilogram and
second

4. Using Decimal notation would be
very troublesome to do for extremely
small or large numbers such as the
distance between air molecules and
instead of repeating it many times
we can use prefixes to represent the
quantities

5. We will be working in the SI
system, in which the basic
units are kilograms, meters,
and seconds. Quantities not
in the table are derived
quantities, expressed in
terms of the base units.

6. Unit Analysis
A powerful way to check your calculation is to
use unit analysis
Not only must the numerical values on both
sides of an equation be equal, the units must
be equal as well

7. Unit Analysis
A powerful way to check your calculation is to
use unit analysis
Not only must the numerical values on both
sides of an equation be equal, the units must
be equal as well