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Which describes the 1D gravitational force in this figure?

  1. Mar 16, 2015 #1
    1. The problem statement, all variables and given/known data

    1)Which describes the 1D gravitational force in this figure. (+x is to the right.)

    a)Something else.
    b)Fgrav=−GMmx2
    c)Fgrav=+GMmx2


    2)In moving the little mass m from x1 to infinity the force of gravity does _____________ work.

    a) positive
    b) negative
    c) no

    I added an attachment for the figure


    2. Relevant equations


    3. The attempt at a solution

    I only have one attempt at it so I want to make sure my logic is right.

    1) I think the answer is Fgrav=−GMmx2 because the little mass is going away from the gravitational pull
    2) Because of my explanation in #1, I believe the answer is negative


     

    Attached Files:

  2. jcsd
  3. Mar 16, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    I agree.
    We don't know where the mass is going, but x is going in the "away" direction.
     
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