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: Right hand rule finding torque help

  1. May 4, 2010 #1
    1. The problem statement, all variables and given/known data
    It is part of a question, i am not sure how to use RHR to find direction.
    http://img220.imageshack.us/img220/2594/rhr.jpg [Broken]

    Uploaded with ImageShack.us
    I need to find direction of torque by using right hand rule with the Force vector and R vector ( pointing away from pivot point i think, for rigid body)

    2. Relevant equations


    3. The attempt at a solution

    I put the tails of F and r vectors together, and point thumb away from me, with hand parallel to r vector, and then curl my 4 fingers toward F i get clock wise.

    Im not sure if i am right. thanks
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 4, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks good to me. (Assuming I understand your diagram.) To curl your fingers from r towards F, your thumb must point into the page. Thus the torque vector will be into the page, or (equivalently) the torque will be clockwise.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook