Gravity, gravity and things we still think

We still know that gravity is a gravitational force, it helps everything to be tied to the ground. However, that is just a theory. What about other explanations?

What is gravity?

Gravity is the gravitational pull of the earth acting on an object, vertically and oriented toward the earth. Gravity is determined by the volume product of the object with free fall acceleration at the place where the object is located. P is the weight N m of mass kg g accelerated free fall m / s2.

What is gravity?

Normal Gravity is understood as. However, according to Einstein's theory, gravity is not a force, but something that pulls things together. Therefore in this translation it will remain from gravity without translating specifically.

Every time you jump, gravity pulls you down to the ground. If there is no gravity, when you jump up, you will fly around in the air with everything on Earth.

The truth about gravity

You can see gravity everywhere, when you drop a book, when you step up the stairs, or when you throw a ball away. It is present anytime, anywhere in life. There have been many theories have been made, to explain why the book fell to the ground, but it is still all theory. The mystery of gravity remained intact.

So what do we know about gravity? We know that gravity makes things in the universe approach each other. We know that the gravity contributes to the formation of the universe, it keeps the Moon around the Earth, and it is also used in some tools such as gravity or gravity.

Scientifically, as we know, Isaac Newton defined gravity as a force - it attracted all things towards each other. And we also know that, according to Albert Einstein, gravity is the result of distortion between space and time. These two theories are best known, and are often used to explain gravity.

Let's work together to see what Newton and Einstein's theory is like, and let's take a closer look at gravity.

Although before, there were many people who were dimly aware of the presence of gravity, but Newton was the first to give the most specific explanation. Let's start with it.

Newton's Gravity

British physicist and mathematician Isaac Newton sat under an apple tree to read books - the story told it. Then suddenly, an apple fell on his head. And he thought, why does the apple fall to the ground?

Newton published the theory of universal gravitation - Theory of Universal Gravitation in the 1680s. Basically, it consisted of four ideas, indicating that gravity is a computational force, acting on everything. in the universe, and is calculated by the formula related to distance and mass. According to this theory, all types of particles in the universe have gravitational pull that draws other particles towards them (to make it easier to imagine, you imagine, a particle is Earth, and one is you, for example) with a force. proportional to the mass of particles and inversely proportional to the square of the distance between them.

So the farther apart the two particles are, or the smaller their weight, the smaller the attraction between them.

The standard formula of gravity between two objects is as follows:

Gravitational force = (G * m1 * m2) / (d ^ 2)

Where G is the gravitational constant, m1 and m2 are the mass between the two objects, and d is the distance between them. G is a physical constant, according to the Organization for Scientific and Technological Data (CODATA), in the SI international measurement system, G is equal to 6.67 x 10 ^ -11 Nm ^ 2 / kg ^ 2.

Applying the law to the Earth. With a mass of about 6 x 10 ^ 24kg, Earth has a very strong gravitational force. That's why you're still stuck on the ground, instead of floating in the universe.

Gravity also affects objects through the weight of the object. When you step on the scale, weight measurements show how gravity affects your body. The formula for weight calculation is as follows:

Weight = Weight xg

With g is the gravitational acceleration. Acceleration is a constant that depends on the Earth's gravity, about 9.8m / s ^ 2, it does not depend on the mass of the object. That's why, you see, a book, pen or feather falls from the same height, they touch the ground at the same time.

For hundreds of years, Newton's theory has a strong foothold in the scientific community. But this changed in the years of the 20th century.

Einstein's Gravity

Albert Einstein, who received the Nobel Prize in Physics in 1921, gave another theory of gravity. This is part of the Theory of Relativity, and it shows a completely different interpretation of Newton's law of gravitation.Einstein did not think that gravity was a force, he argued that this was a distortion of space and time, in other words, the fourth dimension.

For classical physics, an object will always stand still or move evenly if there is no force acting on it. If so, when there is no external force, the two objects are moving in parallel with equal speed, will retain their movement all the way, and they will never meet each other.

But in fact, they will touch each other. The particles start and move on parallel lines and will meet. Newton's theory said that this would happen due to gravity, a gravitational force between objects. Einstein also said it happened due to gravity, however, gravity was not a force. It is a space-time curve.

According to Einstein, these objects still travel in a straight line, however, due to the distortion of space - time, the actual lines follow a sphere. And so, objects that are moving on a plane, are actually going 'straight' on the sphere, and they will meet at a certain point.

In addition, recent theories of gravity interpret it according to the phenomenon of waves and particles . On the one hand, there exist particles called gravitons that cause objects to be attracted by other objects, gravitons can never be observed. And besides, are gravitational waves , sometimes called gravitational radiation , thought to be born when an object accelerates due to the impact of external forces .

Whether there are gravitons or no gravitons, we know for sure that a flying object must fall down. Hopefully, one day, there will be a reasonable theory to explain everything. For now, just know that the Earth will not be swallowed up by the Sun, because there is gravity that keeps the Earth calm in its orbit.