1. Not finding help here? Sign up for a free 30min 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!

Lennard Jones Potential Equation: Repulsive and Attractive terms?

  1. Aug 9, 2009 #1
    http://www.ph.qmul.ac.uk/phy108/CM2008_week2_exercise1_solution.pdf [Broken]

    The L-J Potential Curve in question 2),

    V(r) = V(r) repulsive + V(r) attractive

    Is the ^12 term the repulsive term and ^6 is the attractive term?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Aug 9, 2009 #2

    gabbagabbahey

    User Avatar
    Homework Helper
    Gold Member

    Well, [itex]\textbf F=-\nabla V[/itex]....what sign does an attractive force have? Which term in the potential produces a force with that sign?
     
  4. Aug 9, 2009 #3

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Alternatively, keeping in mind that the force acts in the direction of lower potential:

    Image a graph of 1/r12. Is that an attractive or repulsive potential?

    Do the same for a graph of -1/r6
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Lennard Jones Potential Equation: Repulsive and Attractive terms?
Loading...