What is energy? Detailed answer

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What is energy? Detailed answer

Big encyclopedia for children and adults

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What is energy?

You probably read in the newspapers that the most important task of scientists is to obtain atomic energy, which would serve man for peaceful purposes. That this has already been achieved is the greatest achievement of the human mind.

Albert Einstein put forward the theory of the relationship between matter and energy. In other words, he proved that matter can be converted into energy. It has changed our perception of the world around us. Matter turned out to be secondary: energy turned out to be the most important factor in the world.

What is energy? Energy is the ability to do work. This is what is behind the concept of force, which makes it possible for forces to exist. To understand this, let's take a car.

In order to set the engine in motion, force must be applied. It has to be obtained from somewhere. From energy. And where does the energy come from? It is obtained from gasoline during its combustion in cylinders. This energy sets in motion certain forces that impart movement to the mechanisms of the car. As a result, the engine works, and this is made possible thanks to energy.

There are two types of energy - potential and kinetic. Let's look at the potential first. In gasoline, electrical forces attract the molecules to each other. The energy stored in these molecules is potential energy. When gasoline is burned, this potential energy is released.

Another example of potential energy is a suspended load. Energy is stored in this cargo, we can release it when the cargo starts to fall down. Water at the edge of a waterfall or at the crest of a dam also has potential energy.

Now let's release the load or follow the water falling in the waterfall. They fall at a certain speed, doing work, this energy is called "kinetic energy". This is the energy received by a body moving at a certain speed. A falling body loses potential energy and gains kinetic energy. The magnitude of the two types of energy is equivalent. In reality, the total amount of energy in the universe always remains the same. We cannot destroy or recreate energy. When generating energy, we use the energy of falling water, coal, an atom, turning one type of energy into another.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How big can tortoises get?

The largest of the land turtles are elephant (or giant, gigantic) turtles (Geo-chelone elephantopus, or Testudo gigantea), preserved only on the Galapagos Islands in the Pacific Ocean and on the Aldabra Atoll in the Indian Ocean.

Not so long ago, the mass of such turtles reached 400 kilograms, the shell length was 2 meters (reptiles grow throughout their lives, and the life expectancy of these giants is estimated at 100-150 and even 300 years).

In past centuries, these huge herbivorous turtles were mercilessly destroyed by sailors who filled the holds of their ships with live "canned meat", which did not even have to be fed, because, like all reptiles, they can do without food for a long time.

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