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Using dimensional analyisis to verify formulae

  1. Nov 27, 2009 #1
    Heres a question I never figured out.

    "Using dimensional analysis, determine which formula (a) or (b) is correct for the description of the force due to gravity between a body of mass m (kg) and another of mass M (kg) separated by a distance of r (m). The gravitational constant G has units (m^3s^-2kg^-1)
    (a) FG = G m M / r^2 (b) FG = G m M ./ r"

    I've been looking up dimensional analysis but can't find any information relating to validating formulae.
  2. jcsd
  3. Nov 27, 2009 #2

    Doc Al

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    Staff: Mentor

    For an equation to be physically meaningful, the units on each side must match. Check the units in these two and see what you find.
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