Objective of Physics-Inews71

1.Objective of Physics 

Already you know that physics is that branch of science which explains the change of position of an object with time in the presence of energy and force. Like any other science, the main objective of physics is to learn, the arena of knowledge in physics is very large. The objective of physics is to unfold the mysteries of both small atoms and the vast universe. For understanding easily we can divide the objective of physics into three parts: 

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1.1 Unfold the Mystery of Nature 

In ancient times in China, a piece of lodestone was seen to attract another by an invisible force. This special property of this special type of matter was called magnetism. Similarly in ancient Greece when a substance called amber was rubbed with wool, they attracted each other with an invisible force. This special type of property is called electricity. Many types of research were conducted on it in the eighteenth century and the scientists discovered that this is actually two different forms of the same force and this force is called an electromagnetic force. After the invention of radioactivity while explaining a special radiation called beta ray, a new type of force called weak nuclear force was discovered. Later on, the physicists showed that electrometric force and weak nuclear force are different forms of the same force. Their combination is called the electroweak force. The physicists think that two other forces in nature called gravitational force and nuclear force will be brought under the same law in the future. 

Physics is unveiling the mystery of nature one after another. Similarly, we can say that an object consists of molecules, later on, we see that the molecules consist of atoms of elements. Despite the atoms being charge-neutral, there is a positively charged nucleus at the center and surrounding it electrons are revolving. Though an electron is an elementary particle, it is seen that the nucleus consists of protons and neutrons. It is there seen that neutrons and protons also consist of elementary particles called quarks. At present, the research topic is whether electrons and quarks are made of strings. 

1.2 To Know the Laws of Nature 

From time immemorial we know that if something is released from above, it falls down and seeing this we can guess that the earth attracts everything towards its center. If physics stops after pronouncing only the existence of gravitation, this is not enough at all. The knowledge will not be appropriate until accurately we know the force by which an object of a definite mass attracts another object of another definite mass and how the force varies with the distance between them. Newton explained this law of nature properly with the help of the law of gravitation. The laws of nature can be used in many other places. So, the motion of a falling body is explained with the help of gravitation, similarly, the rotation of the earth about the sun can also be explained. To know the laws of nature properly the scientists analyzed them with argumentative discussions, while also conducting experiments in the laboratory. Behind the wonderful success of physics, both theoretical and experimental researches have been conducted. The main objective of physics is to find out the laws of nature by doing research in these two different fields. 

1.3 Development of Technology Using the Laws of Nature 

From the theory of relativity, Einstein deduced the law E = mc2 and showed that mass can be converted into energy. In 1938, by breaking a nucleus Otto Hann and Fritz Strassmann showed that the amount of mass reduced is converted into energy. it's Using this formula the nuclear bomb was made and dropped on Hiroshima and Nagasaki in the Second World War and millions of people were killed within a second. Not only deadly weapons can be made but also it is possible to use for the good of mankind. Solid-state physics is a branch of physics where semiconductors are studied. Mixing some special elements with semiconductors, transistors are made. With the help of this technology great development of electronics has occurred and this has made a major contribution to the present civilization. 

In this way, we can show that physics has a small or large contribution in every field of technology.