Gravity Essay -- essays research papers

Gravity is really an unknown displume. Wecan define it as a field of influence, andthat it effects the entire existence of theuniverse. Some people look that gravityconsists of particles called gravitons,which travel at the speed of light. Theonly thing we do know is how gravityoperates in different parts of our universe.Without gravity, there would be no spaceand time.There is a legend that says that Galileoonce dropped dickens objects off the LeaningTower of Pisa to show that the heavier ofthe two objectsdropped faster. If a feather and hammerwere the two objects he used thenobviously the hammer would hit theground first. This is due to stress unsusceptibility,which is the jam air exerts on a movingobject. This force acts in the oppositedirection to that of the objects motion. Inthe case of a falling object, air resistancepushes up as gravity pulls down, whichcauses the object to slow down. WhenGalileos sample was repeated on themoon, the hammer and the feather hit thegroun d at the exact like time. This is dueto the fact that the moon has no atmosphere.Therefore, air resistance doesnt exist onthe moon. Also, the amount of airresistance on an object depends on thespeed, size, shape, and density of theobject. The larger the surface argona of theobject, the greater the amount of airresistance on it. This is why feathers,leaves, and sheets of paper fall moreslowly than pennies, acorns, andcrumpled balls of paper. There is another legend that states thatwhen northward was lying against a channelise inan orchard, he was struck on the head byan apple. He wondered what provided theacceleration for the apple to fall to theground. Was this a force of the earth onthe apple? If so, then the apple must exerta force on the earth according toNewtons law of action/reaction forces.Newton applied this theory unto theplanets, which orbit the sun. He found bystudying astronomical data, that the forcethat held the earth in orbit around the sunwas the same force that dr ew the appletoward the earth. This was theforce of gravity that is given by this scaryformulaF = Gm1*Gm2gravity _______r2F equals the force in Newtons, G equalsthe gravitational constant which is 6.67 *10-11 Nm2 kg2, m1 and m2 equalthe mass of each body in kilograms, andfinally, r equals the outperform between the2 bodies in meters.If all of this i... ...forthe electronic revolution of the twentiethcentury. Electromagnetic waves not onlyrevolutionized our lives, but also ourknowledge of the universe. Astronomersgradually loose the electromagneticspectrum, first using visible light and thenradio, x-rays and gamma rays. Each newpart of the spectrum provided us withdramatic new insights into the universe.Einstein predicted gravitational waves in1916. They have not yet been directlydetected on earth, although astronomersJoe Taylor and Russell Hulse received the1993 Nobel Prize for proof of theirexistence, by showing that a star placement is losing energy by producinggravitational w aves.Gravitational waves are a comp permitely newspectrum. If electromagnetic waves let ussee the universe, gravitational waves willlet us hear the universe. They will provideus with a new sense, the sense of hearing,with which to explore the universe. Gravity is a very complicated subject, butscientists are learning more and moreabout it as time goes on. Contributionsfrom people such as Newton and Einsteinhelped shape the way we see thingstoday. Without them, no telling what kindof misconceptions we all might believe intoday.