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# This Is An Essay I Did On Explaining How Gravity Works As Well As How It Effects The Tides... How High Tide And Low Tide Work

1292 words - 6 pages

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 sun's 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 (Newton's per Kilogram) roughly, depending on where you are on earth.GravitationThe original idea of gravity was ...view middle of the document...

If the skydiver streamlined himself and dove head first, he would hit the ground first. It all depends on air resistance.Gravity has a lot to do with the mass of the object that produces it(i.e. Earth's affect on Newton's apple). The larger the object (Earth) the bigger the force.Weight is another thing affected by gravity. The weight of an object is different on different planets. Weight is a factor of mass. The gravity of the moon is about 1/6 that of the Earths. ( Earths is 9.8 kg/N the Moons is1.6 kg/N) (NASA Gravity) To determine the weight of someone, you would multiply their mass by the gravity of wherever they are. So, someone with a mass of 15kg would weigh 147kg on Earth and 24kg on the moon. This explains weightlessness in space. In space there is no gravity, so you have no weight.TidesAt any time on earth there are 2 high tides and 2 low tides, each directly across from each other, as shown in the diagram above. In this diagram,(from Physics for a modern world 1986), points 1 and 2 are at high tide and points 3 and 4 are at low tide. The force of the moon on the earth complies with normal laws of gravity. While the moon pulls strongly upwards (away from the earth) on the water closest to itself, it pulls the water on the far side of the earth downwards (towards the earth). The earth however, has a MUCH stronger force of gravity which keeps the ocean from falling off (Gravity and Tides 2000). So from this we might expect that the oceans would simply bulge up on the Moonward side of the Earth. But this is not the full story. Both the Moon and Earth exert forces on each other as well. The downward force exerted by the Earth on the Moon pulls the Moon toward it, causing it to fall inward. But, because the Earth is always moving sideways, the Moon will never fall on us. As the Earth moves sideways, or away from the moon, the Moon is falling towards Earth, this keeps them relatively the same distance apart at all times. In other words, the moon orbits around the earth. But although we usually talk about the Moon orbiting the Earth,"it (the moon) also exerts a gravitational force on us (earth) which in turn orbits about the Moon. 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,...

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