8/12/2019 Physics IX Chapter No1-2.Docx[1]
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Chapter No:01
INTRODUCTION
Qno:1 What is Physics ? Name a few branches of physics ?
Ans: Physics is taken from Greek word Physikos which means
Natural .
Physics is the branch of physical science.
Physics is defined as a science which d eals with
the interaction of matter and energy .
BRANCHES OF PHYSICS
1) Mechanics: It deals with the motion of objects with or
without reference. 2) Electricity : It is concerned with the
phenomena ( ) and effects( )
related to electric charges. 3) Electromagnetism: It deals with
observations, principles, laws and methods
that relate electricity and magnetism. 4) Solid State physics:
It is concerned with the structure ( ) and
properties( ) of solid materials. 5) Atomic Physics: It is
concerned with the structure and properties of the atom. 6) Nuclear
Physics: It is concerned with the structure, properties reactions
of the
nuclei of the atoms. 7) Plasma Physics : It is concerned with
the properties of highly ionized atoms
forming a mixture of bare nuclei(nuclei without electrons) and
electrons.
8) Bio-Physics: It is concerned with the application of physical
methods andexplanation to bio- physical systems and structures.
9) Astro-Physics: It is concerned with the st udy of the physi
cs of astronomical bodies.
Example : sun, stars, moon, planets etc.
Qno:2 What is the contribution of Al-Haitham in the field of
Physics ?
