What is the force of gravity

Albert Einstein also said that everything around him was a real miracle, and he was right. We, in the everyday life of everyday life, often stop noticing natural phenomena, taking them for granted. Such a fate did not escape the force of gravity. The funny story associated with its discovery, everyone knows: it's enough to remind about Newton and the apple that fell on the head of the scientist.

The idea of what gravity is, a person receives as a child. So, horizontally thrown snow gradually changes its trajectory, deviating downwards, and falls to the ground. Sledge roll down the hill. Rain drops tend to the ground, etc. Yes, and bruises with bruises from falls - in them, too, "to blame" the force of gravity.

The earth, like any other planet, draws to itself any material bodies that have fallen into the zone of gravity. As the distance from the attracting object decreases, the intensity of the effect decreases. Since the snowball is attracted to the ground, and not the earth to the horizontally flying snow, it can be assumed that the force depends on the mass of the body. Another question: why is the trajectory of a snowball a curve, and immediately after the throw of an immediate fall does not occur? Obviously, gravity is characterized by intensity, it has a certain value that can be measured, which was done by I. Newton.

He wondered why objects of different masses, falling from the same height, reach the surface at different times. To clarify this, the scientist made a simple experiment: he placed several objects of various mass in a glass tube, for example, a lead ball and the lightest fluff. In the tube itself, a vacuum was created and turned it 180 degrees. As a result, all the objects that were on the bottom, found themselves at the top and under the action of gravity rushed down. Watching the fall, Newton found that all the objects reached the bottom at the same time. This allowed us to assert that the force of attraction has the same effect on all objects, regardless of their mass.

However, life experience suggests the opposite: the fluff will fall after the lead ball. In fact, this is easily explained, because the difference is not only in mass, but also in the presence of atmospheric air, which inhibits the fall. This resistance depends on the density of the body, its shape and, as a consequence, height. Under ideal conditions, when the field propagation zone is large enough, the distance from the massive attracting object (planet) tends to infinity, and there is no influencing medium between the falling objects and the surface, the fall will occur with the same acceleration. At the same time, if we take into account the fact that the force of gravity is the force by which the bodies intertwine, then, with infinite distance (ideal theoretical conditions), the weight of the falling object will also affect the fall. In other words, although the planet exerts an influence F = m * g on the fluff and ball, they, in turn, also attract the planet. But since the masses are not comparable, then this "additional" force in calculations can be neglected.

The action of gravity informs all objects of the same acceleration, at the surface of the Earth it is 9.81 m / s². As already indicated, with the distance the force weakens, which was confirmed by measurements at the upper boundary of the atmosphere - there is an acceleration of less than 9 m / s². Acceleration of gravity depends on the massiveness of the object, thus, on the Sun this value reaches 273 m / s².

After carrying out his experiments, Newton determined that the force of gravity is a product of the mass of the body for acceleration, and formulated his famous formula F = m * g.

It should be noted that, proceeding from this formula, it follows: g = F / m. This gives the dimension for the acceleration of gravity - Newton / kilogram. This designation is equal to "m / s²".