physics and measurement

PHYSICIS:
PHYSICS IS A GREEK WORD (PHYSIKOS)WHICH MEANS NATURE
DEFINITION:
THE BRANCH OF SCIENCE IN WHICH WE STUDY ABOUT MATTER, ENERGY AND THEIR MUTUAL RELATIONSHIP
OR
MEASUREMENT:
THE COMPARISON OF UNKNOWN QUANTITY WITH KNOWN (STANDARD) IS CALLED MEASUREMENT
QUANTITY:
THE AMOUNT OF ANYTHING IS CALLED QUANTITY . WE HAVE TWO TYPES OF QUANTITIES
(1): PHYSICAL QUANTITIES
(2): NON PHYSICAL QUANTITIES
(1): PHYSICAL QUANTITIES :
ALL THOSE QUANTITIES WHICH CAN BE MEASURE IS CALLED PHYSICAL QUANTITIES
EXAMPLES: LENGTH, MASS, VOLUME, E.T.C
(2): NON PHYSICAL QUANTITIES :
ALL THOSE QUANTITIES WHICH CAN NOT BE MEASURE IS CALLED NON PHYSICAL QUANTITIES
EXAMPLES: FEELING, LAUGHING,E.T.C
KEY POINT: SHADOW IS WHICH THPE OF QUANTITY??
ANSWER: WITH RESPECT TO SIZE IT IS PHYSICAL QUANTITY .AND WITH RESPECT TO MASS IT IS NON PHYSICAL QUANTITIES
TYPES OF PHYSICAL QUANTITIES
THERE ARE TWO TYPE OF PHYSICAL QUANTITIES
(1): BASIC PHYSICAL QUANTITIES
(2): DERIVED PHYSICAL QUANTITIES
(1): BASIC PHYSICAL QUANTITIES:
ALL THOSE PHYSICAL QUANTITIES WHICH CAN NOT BE EXPRESS IN THE TERM OF OTHER PHYSICAL QUANTITIES AND ALSO CALLED FUNDAMENTAL QUANTITIES