Freefall ..What a Hole


Freefall
General term for any movement controlled by the forces of gravity. The free fall is not limited to the movement down, if he was any body in the air, it will be in free fall at every point of the track. Although the objects in space do not "fall" really toward each other, but it is always in free fall even though it affected the attractiveness of many fields of celestial objects.
And when a person is exposed to aircraft free fall, it is also in free fall and exposed to the phenomenon called "weightlessness." Since the same effects of gravity is located on both the person and the plane, it does not feel any wheel commensurate with the plane.
And have expressed this phenomenon successfully in the fourth century AH / tenth century, Ibn al-Haytham in his sights: "movement gained but are, according to the amount of space and according to the amount of weight." Thus Ibn al-Haytham decides to force movement but are, according to the distance of the fall and according to what in the body of the article. While known Ikhwan al-Safa amount of gravity in their messages by saying: "The gravity and lightness in some objects, it is for that objects colleges each one has been ad hoc, and be standing where no out except coerce Qasr, and if acetic returned to its place its own, the prevention blocker signed a conflict between them, the tendency was towards the center of the world is called a heavy, albeit towards the ocean called the light ".
In the sixth century AH / twelfth century between'm king Baghdadi that the speed of the fall growing influence of Earth's gravity, he wrote what counts: "you see that the principle purpose whenever far, was the last movement faster, and the strength of his penchant most, and so encouraged and crushed. Nor be him if he was for a shorter distance, but shows the variation in the extent of the long distance routes. "
In the sixth century AH / twelfth century realized Alkhazina relationship between the strength of precipitation and the distance between the body falling and the center of attraction, he wrote, the balance of wisdom: "The falling objects gravitate towards the center of the earth. Though differing power of attraction due to the distance between the body falling and this center." This clear signal that the body whenever the fall distance is longer, higher speed was falling, and then the force of a more severe collision. A concept that the amount of movement that are commensurate with the speed of the body and its mass.
And try skydivers free fall for a short time before opening the parachute, but then become air resistance force against the body of the jumper is important and can not then fall free fall. In fact to say, can reach a top speed of about 180 to 250 km / h and this depends on the position of the body of the soldier. The plane can simulate free fall conditions for up to about one minute by flying in a specific path on parabolic and then exposed passengers to weightlessness for a temporary period.
In fact to say, there are other side effects of gravity can not be avoided or prevented, for example, air Resistance in Earth's atmosphere reduces the rate of fall of thing while there are other friction forces less obvious influence on the speed of rotation of objects.




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