1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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.

    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


    User Avatar
    2017 Award

    Staff: Mentor

    I agree.
    We don't know where the mass is going, but x is going in the "away" direction.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted