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Homework Help: Gravitational Forces/ Tides

  1. May 16, 2007 #1
    1. The problem statement, all variables and given/known data
    What three gravitational forces act on the oceans of the earth to cause the tides?

    3. The attempt at a solution
    Hi. I was wondering if anyone could help me with this question.
    Everyone knows it is the gravitational force of the moon, but that's about it. :frown:
    Could the gravitational force of the earth and of the sun also be involved?
    But then why not add Mars and all the other planets, as they exert a force too, more or less.
    I also found answers such as the gravitational force of the moon, the sun and inertia or earth's rotation but that's not a gravitational force.
    Thank you.
  2. jcsd
  3. May 16, 2007 #2


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    Staff Emeritus
    Science Advisor

    Check the relative influence of the Earth, Moon and Sun, and perhaps look at the influence of Mars and Venus.
  4. May 16, 2007 #3
    This question had so many marks.
    After researching, I decided on the moon, the sun and the earth.
    Thank you for the suggestion.
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