What is the importance of physics?




Hope this article will make the learning more fun and interesting. Let’s see what you will study in Std. XI‐XII. Based on the topics you will master mind you can understand how physics is important for you. Physics is the study of nature and natural phenomenon. Scientists discovered the rules that govern the nature.
Let’s select few chapters of physics

How does a motor cyclist move inside a circular cage in circus?  Have you seen Well of death (mout ka kuan in fun fair), how does they motor cyclist moves in a horizontal circular path and still able to maintain balance.

Suppose you are in a bicycle/motor cycle and taking a turn at a very high speed, you need to incline your bicycle to keep balance. How much inclination or bending required depends on your speed.  
What holds such huge mass like moon or INSAT series satellites which make them to move around earth? Read carefully centripetal force.

During war have you seen anti missile technology, whenever a missile fired its projectile track detected and before it hits objects on earth intercepted in air. Have you seen maximum speed limit say 40 KM/Hr like board while moving through a curved bridge? 

How does civil engineer calculate such speed limit? Exceeding such precautionary speed limit often causes accident as your vehicle practically loses contact with ground.  
How does cricketer swing ball, often fast bowler use wind current and succeed to do in‐swing, out‐swing, Yorker physics helps you to understand the reason of swing.     
      
Gravitation: Sir Isaac Newton said, apple feels attraction towards earth that’s why it falls to ground. Such a simple observation led us to find natural laws of gravitation and we understood to some extent how does the such vast universe maintaining balance. Do you know we have in India 6 lakhs villages and our farmers/fisher men gets help from weather forecasting? This forecasting takes place by taking snap of ind/cloud/atmosphere over a region using our satellite. At what speed we should project the satellite? at what distance it should be kept from earth so that it will rotate once in 24 hours. In physics we call it Geo‐Stationary orbit. You will calculate and surprise others after studying chapter of Gravitation.

Radio‐activity: Often we see such news that age of this tree is 4000 years, how can determine age of tree? you will come to know about this simple technique called radio‐carbon dating. Simply by changing atomic configuration i.e. by bombarding with atoms we can change the element itself.

We know world is now searching for alternative source of energy, petrol,coal,gas all together is not enough to meet our energy requirement. Though we are tapping solar energy, trying biological gas as alternative source of energy but one thing which actually coming up to every scientist mind is Nuclear energy. Energy through fission. When you will go through this chapter you will surprise to find 1 gm of uranium can give equivalent energy which can be produced by burning few Metric Tons of coal. How much metric ton of coal? This calculation I left it to you. Digital‐electronics:

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