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Homework Help: Gravitation equations and expressions - gravitational field strength

  1. Apr 8, 2013 #1
    1. The problem statement, all variables and given/known data
    i have 2 questions on my holiday homework that im not 100% sure on they are:

    2. Relevant equations

    1) write down an algebraic expression for g at a distance r from the centre of the planet. The planet can be treated as a point mass of magnitude M as its centre


    2) write down a formula for the gravitational field stength g at the surface of the planet of mass M

    3. The attempt at a solution
    is one of them g=Gm/r^2
    i am so confused
  2. jcsd
  3. Apr 8, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    If you replace m with M, yes.
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