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Hi Our teacher told us the following:F = m * v² / r = m * 4 pi² /

  1. Oct 18, 2011 #1
    hi

    Our teacher told us the following:

    F = m * v² / r = m * 4 pi² / T² * r

    = m * 4 pi² / k * 1 / r²

    = c * m / r²

    F = y * mM / r2

    Why is there the k and 1 / r² and later the c?
     
  2. jcsd
  3. Oct 18, 2011 #2

    vela

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    Re: Gravitation

    Did this have to do with one object orbiting another?
     
  4. Oct 18, 2011 #3
    Re: Gravitation

    Yes, it's about the Earth around the Sun for example.

    PS: I now understand the c but still not k (is it the same?) and 1 / r² :S
     
  5. Oct 18, 2011 #4

    vela

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    Re: Gravitation

    Are you familiar with the following formula?
    [tex]T = 2\pi\sqrt{\frac{r^3}{GM}}[/tex]where T is the time taken for one orbit, r is the radius of the orbit, G is the gravitational constant, and M is the mass of the body being orbited.
     
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