Physics is an efforts at seeking the ultimate truth about the physical would. The physicists believes that mankind will continue to get closer and closer to the ultimate truth. A major preoccupation of physicists is the study of elementary particles, their properties and their interactions. only four fundamental interactions listed below, have been discovered so far. All the observed forces and interactions in the universe can be broadly based on these interactions:

(a) Gravitational interaction,

(b) Weak interaction,

(c) Electromagnetic interaction,

(d) Nuclear interaction.

The interactions vividly bring about the concepts of both 'a very tiny world' and 'a very large world'. The laws of physics which rule stars and galaxies also govern elementary particles.

physics plays a crucial role in technology. The outstanding contributions of physics to technology are radio-engineering and electronics. Prior to this, the outstanding contributions were electricity, aviation, aerodynamics and hydrodynamics. If we go back to three hundred years back, we shall find the pioneer Italian physicist Galileo, trying to find out the ways and means to support heavy beams without breaking them.

Physics is the key to the answer of questions-involving the behaviour of non- living things in nature. What are electrons? What are atoms? What are molecules? How do the sum and stars produce intense heat and light ? Is it possible to create of destroy matter? What holds protons and neutrons together in the nucleus? A number of such questions can be answered by physics.

This society of ours has become more and  more Science-oriented. Even those of us who do not plan to become direct does of science will be better members of society if we develop an understanding of the basic laws of physics.