We all know that the Earth rotates simultaneously around the Sun and on its own axis. The speed of this rotation is not low. It revolves around the sun at a speed of about 1 lakh 7 thousand kilometers per hour. And it rotates around its axis at a speed of about 1,600 kilometers per hour. But we don't understand it. Why can't I?

the world

Before he answers, think you're in for a whirlwind. It will spin you a few pucks. A person or a machine will do the work of rotation. But no matter how it is rotated, the speed is not very high. are kept almost the same. The speed of rotation of the earth is much faster than the earthquake.

But even then, many people are shocked when they get up to the city. Many people even vomit at this low speed rotation. Then the earth is moving at a speed of a thousand times faster than the sea, mountains and everything, why can't we understand it?

The main reason for this is that the rotation of the earth is constant; Means rotates at the same speed. Actually the pendulum also rotates at the same speed, i.e. constant. The main reason why we don't understand is the Earth's gravity, without it we would fly away. And even if we don't understand it, our body does.

The centrifugal force created by this rotation reduces our weight. If a person has a mass of 100 kg (1000 newtons) at Sumeru, in Dhaka city he will feel that his mass has decreased by 200 grams (although the mass will remain unchanged, he will feel), i.e. his weight will decrease by 2 newtons.

Let me make it a little more clear. Let's take a trip from the world of fantasy. Suppose you board a bus. Going straight ahead. There is no jam problem. Let's say the bus is moving at a speed of 60 km per hour. He sat comfortably on the seat and leaned his head back. He closed his eyes. The sound of the car is coming to the ear. In this situation, you will not understand, are you on the bus or sleeping comfortably at home?

But suddenly the car had to brake. The speed came down to 20 km. It is 40 again and again. Speed ​​breaker is visible in front. Speed ​​reduced to 5 km. But now you will be bored. You will understand the bus you are on. Now understand why? Because the speed of the bus is increasing and decreasing. Not moving at the same pace as before.

For the same reason, the speed of rotation of the earth is not understood. If the world tires of spinning and slows down a bit, you'll feel it. Not only will you feel it, but the soul itself will go away. Even if the speed of the earth were to slow down even for a second, the planet would be destroyed. That is a different matter, I will write in detail in the next article.

Then I understood, we do not feel it because the earth moves at the same speed, meaning always at 1,600 km per hour. Those who have been on the plane, may understand the matter a little better. Tea or coffee is available on the plane. The speed of these passenger planes is about 700-800 kilometers per hour. But even at this speed you can easily pour coffee into the mug. Because the plane moves at the same speed.

Another thing is that there is no such thing as absolute speed, all speed is relative. This was highlighted by scientists like Galileo Galilei, Isaac Newton and Albert Einstein. Galileo asked to imagine a ship. Suppose you are standing somewhere on a ship.

If you do not hear the sound of the ship, you cannot understand whether the ship is still moving or standing at the wharf. You have to look at the water to understand whether the ship is actually moving or not. That is, a context framework is needed. It is understood whether the object is moving or stationary relative to that context frame. Here, water acts as a contextual framework.

A simpler example can be given. You are standing on the side of the road. He saw his friend riding the bus. In this case, you see your friend moving, but you yourself are still. Again your friend is also watching you move backwards from the bus, but he is still.

I mean when you see a friend, relative to whom do you see the friend moving? on your own. You are the context structure and static here. The same goes for your friend. That is, if there was no context structure, you would not see the friend in motion.

This context framework is not available for viewing the Earth's rotation. Means that the world is rotating, relative to whom will you see it? It has no fixed object to look at. Let's go back to the ship example to understand the point better. You don't know if the ship is moving or stationary until you look at the water (context structure).

If you have a friend on this same ship, he will not be able to tell whether the ship is moving or not just by looking at you without looking at the water. Even if you look at the other objects on the ship you will not understand. To understand this, you have to look at something outside the ship.

Now imagine the whole world as that ship. And think of the other objects on the ship as different objects on Earth. The people of the ship are all the people of the world. Can you see a person or object on the ship now, can you understand whether the ship is moving or stationary? Can't really understand. For all objects in the ship will seem stationary to you, if not towards the water or towards any object outside the ship. This is also the case with the world.

We only see the earth's mountains, seas, houses, which are all inside the earth. We cannot see anything outside the world as context. So even if the earth rotates at a speed of 1,600 km on its own axis, we do not feel it.