Chapter 1 – Physical World

This is a hypothesis that is based on the law of observation and experiment. If required then this can be verified with the help of experiments. 

• Law of Conservation of Energy – This law applies to all the entities of the universe. This is based on a simple principle that the energy remains constant and unchanged over time. Under this law, the energy gets converted from one form to another. Here, nature is known to produce symmetrical results at different time intervals. 
  For example, when rainfall falls from the sky then potential energy is converted to kinetic energy. This kinetic energy can further be used to produce electrical energy. 

• Law of Conservation of Mass – This law is used widely in chemical reactions. A chemical reaction in the simplest terms is the arrangement of atoms among multiple molecules. In a chemical reaction, if the total binding energy of the product molecules is more than the total binding energy of the reacting molecules, then the result is heat and the reaction is termed as exothermic. The opposite of this is termed as the endothermic. But you must remember that the atoms are only rearranged and not destroyed and thus, the total mass of the reactants and the produce always remains the same in the chemical reaction. 
  For example, when a wood burns, then the mass of soot, ash, and gas becomes equal to the mass of charcoal and oxygen when first reacted. 
  As per Einstein theory, mass is related to energy. 
  E = mc2
  E – Stands for Energy
  m – Stands for Mass
  c – Stands for speed of light in vacuum 

• Law of Conservation of Momentum – This has two major divisions: the Law of Linear Momentum and the Law of Angular Momentum. If the Law of Nature is directly symmetrical to that of space, then it falls in the category of linear momentum. Let us understand this with a simple example – Law of Gravitation is the same on both earth and moon. But the acceleration power at the moon is 1/6th of that of the earth because of the gravitational force. 
  When the particles in space have no definite direction, then it falls under the category of the Law of Angular Momentum. 

• Law of Conservation of Charge – This is based on a simple understanding that a positive charge is always equal and accompanies by a negative charge. For example, when a plastic ruler is rubbed with a cloth, then the ruler becomes negatively charged whereas the cloth becomes positively charged. 

The physical world is a very wide subject and it’s quite important to understand it fully. Other than the above-mentioned laws and forces, there are a number of other auxiliary forces that govern how the physical world moves. For having a detailed read and complete understanding of the concept, have a look at the MSVgo application. All the concepts and related topics are explained in simple language through videos and examples. For example, you will find multiple videos on gravitational forces where the entire topic is well explained with the help of examples.

1. What is the physical world?

The physical world refers to the laws of nature, forces and its applications around us. 

2. What is the study of the physical world around us?

By study of the physical world, we mean the study of the non-organic world. 

3. What is an example of physical science?

Any study related to inorganic beings is termed as physical science. For example, a study related to the moon, the earth, the sun can be termed as physical science. 

4. What are the 5 major divisions of physical science?

Physical Science has 5 major divisions which are given below:

• Chemistry 
• Astronomy 
• Earth Science 
• Geology 
• Planetary Science