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Homework Help: Gravity force between Earth and Moon from this angle

  1. Jan 22, 2015 #1
    1. The problem statement, all variables and given/known data
    Hello the text is in swedish but ill try my best to translate,
    What it says is:
    Determine the resultant force on the moon with regard to thr gravitation force from the sun and the earth when it's in this position shown in the figure [ picture http://m.imgur.com/AfJOVZo ]
    J represents earth and M represents the moon, i hope you can help me!! I will be very grateful if you do!

    I tried 9.82 x 1/81 (moon weight to earth) but it was wrong!
    It has to do with newtons laws though (9.82 for earth gravity force)
    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 22, 2015 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: Look up Newton's law of universal gravity.
  4. Jan 22, 2015 #3
    The Sun and Earth will exert separate gravitational forces on the moon. Try determining these forces first. Once you have them, you can use the concept of vector addition.
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