Question:

How is it the Moon controls the Tides??

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i know its something to do with gravity, but what if one side of the Earth is facing away from the Moon?

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  1. The force of gravity on the earth due to the moon is stronger

    on the side of the earth that faces the moon, than on the side

    opposite the moon. The effect is that it is as though a stretching force

    were applied to stretch the earth into a football shape with one pointy

    end pointing toward the moon, and the other on the other side of

    the earth pointing directly away from the moon.

    Now, the earth, itself isn't that stretchy, so stretch on the rocks isn't

    more than about a foot, but with the oceans, the water piles up on

    the side of the earth where the moon is, and on the side of the earth opposite

    the moon. These are the ocean tides.

    As the earth rotates, the pointy part of the football travels, trying

    to keep pointing at the moon but lags by a bit (about 6 degrees).

    There is also a football effect due to the sun. These two football

    effects make a "diurnal" (daily) and "semidiurnal" (half daily) tidal

    effect.


  2. Just like the earth has a gravity field that pulls everything to the ground so does the moon but because the moon does not have as much mass (isn't as big) as the earth so the moons gravity field only affects the sea creating the waves. the sea on the other side of the world is still affected by the moon but while the tide of one coast is in, on the other side of the world the tide is out - I think.

  3. The moon pulls the Earth into sort of an egg-shape.  The ocean tends to get pulled toward the moon, raising the tide.  On the other side of the Earth, the moon's gravity is weaker, so they, too will get a high tide.  

    And, it's low tide where the moon is just on the horizon.

      


  4. I would like to add to some of the comments here: the tidal forces we see on the earth's oceans are part of a balance between the gravitational gradient from the moon (and to a lesser extent the sun) and the centripetal effects caused by the wobble that this force puts on the earth.  

    The question asked is very good and I think it's often misunderstood by many who simply answer with the gravity story.  If we were just talking about the gravitational pull by the moon, there would be 1 tidal bulge toward the moon, and the side of the earth facing away from the moon would be less affected (or even have a slight negative tide).  But the orbiting moon imparts a wobble on the earth that creates a centrifugal bulge on the opposite side of the earth.  There's a great animation of this effect on Wikipedia.  It is these TWO forces that create the "football" shape and create a high tide twice per day, rather than once per day.

  5. As you know moon moves round the earth. By mean of that the waters are attached in the same direction. When the moon is full, the attraction is the most and the same the tide. On the opposite it is happend the contrary

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