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kannan narayanan
under Physical Sciences

WHY WE USE

In this world, rotations are more common than the linear motion. The planets revolves and spins; the electron circles; the wheels roll; the motor and the engine runs; even opening and closing a door is a partial rotation. Force required : Newton says that if a body is given a push, it will only move in a straight line. Hence, to keep the body in rotation, a force must act and it should a.....

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kannan narayanan
under Physical Sciences

CRASHING SOFTLY

Consider the pole-vault jumper. Suppose he falls on a hard floor, you know what will happen? He falls on a foam bed that cushions and sags as he hit. On a hard floor, he will experience heavy force all of a sudden. It will cause him injuries. On a cushion floor, the time of force acting on him is elongated. Hence, the average force acting on him per secon.....

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kannan narayanan
under Physical Sciences

YOU CANNOT BE LOST WITH SMART PHONE

We know we can find our location with GPS in the smart phone. Let us see how the Geo-positioning system (GPS) works in simple language. There are circular paths around the earth, and they are called orbits. In GPS system, there are six orbits in different planes across the earth. (see figure). In each orbit, six satellites are going around the earth. .....

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kannan narayanan
under Physical Sciences

SENSELESS QUESTIONS GIVES SENSE

We will try to answer some senseless questions about earth.1. What would happen, if earth were flat? If earth were flat disc, the center of gravity would be at the center of the disc. Men, plants, oceans and all would be attracted towards the center. Everything would slide towards the center, as if they were in saucer. Hence, the globe is the apt shape for the earth.2. If you fall through the earth, what will happen?Yo.....

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kannan narayanan
under Physical Sciences

LEND ME YOUR EAR, I WILL TELLYOUR AGE

If a bell is stroked in a place of worship, it vibrates; set the air molecules in vibration; molecules strike eardrum and vibrates it; our brain interprets the vibrations and we perceive the sound. We understand that the vibrations are the basis for the sound. Number of vibrations taking place in one second is called "frequency". Su.....

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Gracy Jayaraj
under Physical Sciences

Shifting World

Would like to share with you some interesting facts about how Tectonic plates shifting affects the Globe and how does it occur. Before I proceed I will like to ask you : Do you know what is Pangaea, Gondwana or Laurasia OR Tectonic Plates? If you already know please stop reading here and if you don’t know and interested in knowing please proceed further 😊Our Earth more than 600+ million years ago was one land mass which further started separating over a period of era’s t.....

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kannan narayanan
under Physical Sciences

LIFE IS COLOURFUL

We are enchanted by red sunset, Blue-sky, white water falls, green tea estate. What is color actually? We know, light is origin of color. We also know light is electromagnetic wave. The wave..

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kannan narayanan
under Physical Sciences

ARTIFICIAL GRAVITY

Why your washing machine spins rapidly to dry your clothes? Let us find out Think a rotating body. A force called centripetal force must act to keep the body in rotation. That is a constant force but its direction keeps-on changing circularly. So the acceleration is always present in a rotatory motion. More speed means more acceleration and more force[F = ma]. We know,..

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