• Question: how does the moon Impact the tide?

    Asked by anon-181164 to Claudia on 4 Jun 2018.
    • Photo: Claudia Bonfio

      Claudia Bonfio answered on 4 Jun 2018:


      The tide is caused by gravitational forces of the moon and sun on the oceans of the Earth. Generally speaking, tidal cycles contain two high tides and two low tides each day.
      The gravitational force of the moon attracts the surface of the ocean until its surface mounds up and outward in the direction of the moon. When the mound of water has reached its highest point, it is called high tide. The centrifugal force caused by Earth’s rotation produces high tide also on the opposite side of the Earth. Somewhere in between these two high tides are two flat areas on the surface of the ocean, these are low tides.
      Now, the length of time that it takes for the Earth to rotate around so that the moon is in the same position is actually a little over a normal 24 hour day. It is 24 hours and 50 minutes (tidal day). That is why the tidal cycle starts approximately 50 minutes later each day. As the Earth rotates, the fluid mound induced by moon’s gravitational force moves around the Earth.

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