1.1UNDERSTANDING PHYSICS

PHYSICS

CONSEPT OF PHYSICS

SCIENTIFICMETHOD

FIELDS OF PHYSICS

IMPORTANCEOF PHYSICS

CAREERS

Contributions by Famous Physicists

Galileo Galilei (1564 – 1642)

Galileo proposed that a falling body would fall with a uniform acceleration, as long as the resistance of the medium through which it was falling remained negligible, or in the limiting case of its falling through a vacuum

Sir Isaac Newton (1643-1727)

Newton’s Laws of motion

•A body continues to maintain its state of rest or of uniform

motion unless acted upon by an external unbalanced force.

•Net force on a particle is proportional to the time rate of

change of its linear momentum.

•To every action there is an equal and opposite reaction.

Albert Einstein (1879-1955)

“space and time are not as straightforward as they first appear, but are related to each other in a simple but

unexpected way”

Discovered the special and general theories of relativity, proved light's quantized nature by means of the photoelectric effect, and offered important support to atomic theory with his study of Brownian motion.

WHAT IS PHYSICS ?

Physics (Greek: physis – φύσις meaning "nature")

= the natural science which examines basic concepts such as energy, force, and spacetime and all that derives from these, such as mass, charge, matter and its motion.

WHAT IS PHYSICS ?

• Branch of science which studies physical and natural phenomena around us.

• Knowledge of physics can help us understand natural phenomena such as formation of rainbows, the solar eclipse, the causes of sunset and sun rise, the reason for the blue colour of the sky, etc.

WHAT IS PHYSICS?

Chemical energy – Force – Motion

WHAT IS PHYSICS ?Fizik adalah sains asas tentang

fenomena semulajadi

yang menembusi

semua aspek sains,

kejuruteraan dan teknologi

Fields of Study in Physics

measurment Study of the measuring instrument

Force and Motion

Study of the action of force and movement

Heat Study of hot substances

weight = 250 N

Fields of Study in Physics

waves Study of sound, information transfer and telecommunication

optics Study of light

Nuclear physics Study of reactions in the nucleus of an atom

Fields of Study in Physics

Electricity andelectromagnetism

Study the applications of

Electricity and magnetism

electronics Study of electronic chips

And computer system

Propeties of matter

Study the strength of a

substance

CONCEPT OF PHYSICS

• Principle and teory of physics explain;

- how the phenomena accurs and why it accurs in that way.

- understanding their applications.

• A concept of physics is produced through the scientific method of investigation.

• The formation of a concept of physics involves the following steps and stages.

CONCEPT OF PHYSICS

1. Observation - Use the senses to feel the daily phenomenon.

2. Experiment- Perform an experiment to study the required characteristic of the phenomenon.

3. Theory-Suggest the cause of the phenomenon studied through the experiment.

4. Further investigation- Sugest measurements for the theory and modify it if necessary.

5. Application- Invention of technology based on the theories of physics.

Study of Physics - Scientific method

• Observation• Identify a question• Make inference• Formulate hypothesis• Plan and carry out experiment• Measurement and data collecting• Analyse data• Make conclusion• Hypothesis is proved/fails• If hyptotesis fails and is unacceptable, suggest a new hypothesis• If the theory is test several times and the same result is obtained, the theory then becomes a prinsiple of science.

IMPORTANCE OF PHYSICS

• Important in other sciences including astronomy, biology, chemistry and geology.

• Close connection to practical developments in engineering, medicine and technology.

• Fast expanding, leading to advances in technology which have in turn brought many benefits to mankind.

• Creation of sophisticated medical instruments such as magnetic resonance imaging, X-ray etc.

• Improve the quality of life; modern home appliances, automobile, computer etc.

Careers in Physics• Career and job opportunities which are directly or indirectly

related to physics

Field of physics Career

Engineering Mechanical, electrical,

computer, process and

environmental engineering

Research Scientist, professor,

astronaut, specialised

doctor, biophysician

Education Lecturer, teacher,

education officer

Careers in Physics

Industry Geophysician, quality

control engineer

Medicine Radiologist, forensic expert,

technician, science officer,

medical physician

UNDERSTANDING PHYSICS

PHYSICS

CONSEPT OF PHYSICS

SCIENTIFICMETHOD

FIELDS OF PHYSICS

IMPORTANCEOF PHYSICS

CAREERS