1p1 Introduction to physics


What is Physics?

Physics is the branch of Science which deals with matter in relation to energy.

Matter is anything which occupies space and it has weight.

Energy is the capacity or ability to do work.

What is Science?

Science is the systematic study of nature.

A person who studies Physics is called a Physicist.

Branches of Physics Physics is divided into various branches such as; 

i) Mechanics – This is the study of motion of bodies in the frame of reference.

ii) Optics – This is the study of physical properties of light.

iii) Atomic Physics -This is the study of atoms specifically the electrons and its properties.

iv) Electromagnetism – This is the study of electrical and magnetic fields as two aspects of the same phenomenon.

v) Geophysics – This is the study of physical properties of the earth.

vi) Astronomy -This is the study of celestial bodies such as stars, galaxies, planets, e.t.cvii) Electronics – This is the study of the flow of electrons in a circuit.


1. Chemistry- Devices used in studying Chemistry such as Bunsen burner and Centrifugal device are made from the application of Physics. The study ofAtomic Physics is also very useful in Chemistry

2. Biology- Physics has simplified the study of living things. Those powerful microscopes used in studying Biology are made from the application of Physics. Different instruments for measuring blood pressure, body temperature, etc. are also made by using Physics laws.

3. Geography- Various devices used in Geography to study Weather and Climate are made from applications of Physics. Examples of these devices are Barometers, Thermometers and Wind vane. Cameras and satellites have been useful in Survey.

4. Mathematics- Physics laws are usually simplified by using Mathematical expressions. Thus, Mathematics is the language used by Physicists to simplify its information and communication.

5. History- The study of radioactivity in Physics has enabled the use of Carbon 14 to determine dates in Historical excavation.


1. Knowledge expansion The study of Physics expands our knowledge. We learn about how different machines work and also understand how some natural phenomena such as earthquake, floods and winds occur.

2. Carrier development People who study Physics may further study to be doctors, engineers, computer scientists and many other carriers which require the knowledge of Physics.

3. Basis for most modern technology Studying Physics gives a better understanding on a modern technology. Devices such as x-ray machines, gas cookers, refrigerators are made from the principles of Physics.


1. Communication– We use radio, television, telephone for communicating among us everyday.

2. Entertainment- We use music players, Dvd players, computer games, etc. for entertainment.

3. Transportation- We use cars, airplanes, ships for travelling from one place to another place.         

4. In medicine- We use various machines in hospitals for diagnosis and treatment e.g x-ray machine, ultra sound machine, thermometers, etc

5.Agriculture- We use farm equipments such as tractors, harvester,sprinklers, etc 


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