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Homework Help: Find gravitational force

  1. Nov 16, 2011 #1
    1. The problem statement, all variables and given/known data
    what is the gravitational force acting on a person due to another person standing 2 meters away? assume each individual has 59kg mass.


    2. Relevant equations
    looks like i tried to use w=mgy
    but that was wrong.
    with that you get like 1156.4

    3. The attempt at a solution
    the answer is 5.8*10^-8N but idk how to get it
     
  2. jcsd
  3. Nov 16, 2011 #2

    Doc Al

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    Staff: Mentor

    Look up Newton's law of universal gravity. (W = mg is the weight of a body near the earth's surface--the gravitational attraction between the earth and the body. You want the force between the two bodies.)
     
  4. Nov 16, 2011 #3
    so Fg=G* (m1m2)/r^2 is g 9.8 or fg?
     
  5. Nov 16, 2011 #4

    Doc Al

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    Staff: Mentor

    That's the correct equation. But there's no 'g' in that equation. What you need is the gravitational constant G. (Look it up.)
     
  6. Nov 16, 2011 #5
    its 6.673*10^-11 thanks i got it now
     
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