This is an essay I did on explaining how gravity works as...

Introduction Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is the attraction that exists between all objects. (NASA gravity 2000) Gravity is a very essential part of life on earth. We are in the exact position in the suns gravitational field to keep us in orbit and keep life ongoing on our planet. Gravity is a downward force on any body of mass, the larger the mass of the body, the stronger the gravitational force. On earth the force is 9.8 N/Kg (Newtons per Kilogram) roughly, depending on where you are on earth. Gravitation The original idea of gravity was discovered by Sir Isaac Newton (Jacob 1999). It is†¦show more content†¦In fact, both orbit about their common center of mass, which is within the Earth but not at its center. This rotation causes an upward centrifugal force on the oceans, which is proportional to the rotational speed and the distance from the center of mass. This force is greater on the far side then the near side (Gravity and Tides 2000) When you add this to the moons gravitational force, they equal. This causes both sides of the ocean to bulge as illustrated in the diagram above causing 2 high tides, about 12h and 25 minutes apart. Relatively the same idea applies to the effects of the Sun on Earth, though the centrifugal force on the near side of earth is downward, not upward. As it turns out, the force of the sun is about half the force of the moon. We get the high spring tides when the Earth, Sun and Moon are in a straight line and their forces are combined. After 7 days when they are at right angles to each other they cancel each others forces giving the low neep tides. A very important factor about tides that is not included in the above, is the height of the ocean floor. Different heights can cause funneling of the tidal flow, heaping the tides up in shallow water and causing even more complex effects where flows meet. Conclusion Gravity is an essential to life. It is also one of the four key physical forces which are, Gravity, Electromagnitivity, Strong Nuclear Force and Weak Nuclear Force (Physics for a Modern World 1986). ItShow MoreRelatedEssay on Silent Spring - Rachel Carson30092 Words   |  121 Pages ©2000-2007 BookRags, Inc. ALL RIGHTS RESERVED. 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