Even Albert Einstein said that everything - the real miracle, and he was right.We're in the routine of everyday life often lose sight of the natural phenomena, taking them for granted.A similar fate has not been spared, and the force of gravity.Funny story related to its discovery, everybody knows: it is enough to recall the Newton and the apple that fell on the head scientist.
notion that such gravity, the person receives a child.So, horizontally thrown snowball gradually change its trajectory, leaning down and falls to the ground.Sledge rolling down a hill.Drops tend to land and so forth. And with bruises bruises from falls - they also "blame" the force of gravity.
Earth, like any other planet, attracts any material body, trapped in the zone of gravity.As the distance from the attracting object intensity of the impact is reduced.Since snow is attracted to the earth, not the land to the horizontal flying snow, it can be assumed that the force depends on the mass of the body.Another question is why the trajectory of snow is a curve, and immediately after throwing an immediate drop does not occur?It is clear that the force of gravity is characterized by intensity, it has a certain value, which can be measured as Newton did.
He wondered why objects of different weight falling from the same height, reach the surface for different times.To clarify this scientist has done a simple experiment: in a glass tube placed several objects of different masses, such as a lead balloon, and the lightest feather.The tube itself has created a vacuum and turned it 180 degrees.As a result, all the items that are on the bottom, top and found themselves by gravity streamed down.Watching the fall, Newton found that all subjects have reached the bottom at the same time.This enabled to assert that the force of gravity has the same effect on all objects, regardless of their mass.
However, experience suggests otherwise: a feather drop later lead the world.In fact, it is easily explained, because the difference is not only in weight but also in the presence of air, retarding the fall.This resistance depends on the density of the body, its shape and, as a consequence, high.Under ideal conditions, when the spread area of the field is great enough distance from the attracting massive object (the world) tends to infinity, and between falling objects and the surface is not affecting the motion of the medium, 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 body vzaimoprityagivayutsya, then at an infinite distance (ideal theoretical conditions) for the fall will also affect the mass of the falling object.In other words, while the fluff has on the planet, and ball impact F = m * g, they, in turn, attract planet.But as the masses are not comparable, and this is an "additional" force can be ignored in the calculations.
gravity informs all subjects the same acceleration at the Earth's surface, it is 9.81 m / s².As already mentioned, the force weakens with distance, which was confirmed by measurements at the upper boundary of the atmosphere - there is acceleration of less than 9 m / s ².The acceleration of gravity is dependent on massive objects, so the Sun is the value reaches 273 m / s ².
After their experiments, Newton determined that gravity is a product of the mass of the body to speed up, and formulated his famous formula F = m * g.
It should be noted that, based on this formula should be: g = F / m.This yields the dimension for the acceleration of gravity - "Newton / kilogram."This symbol on an equal footing with the "m / s²".
