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!

What is the difference among moment, torque and couple?

  1. Oct 18, 2012 #1
    What is the difference among moment, torque and couple?

    Moment = Fd
    Torque = Fd
    Couple mean two forces have same magnitude but opposite direction.

    What is the relationship among them?
     
  2. jcsd
  3. Oct 18, 2012 #2

    Philip Wood

    User Avatar
    Gold Member

    Moment and torque mean exactly the same. You must always specify the point about which you are finding the moment (or torque) of a force. A given force will have different moments (or torques) depending on your choice of point.

    A couple is a pair of equal and opposite forces not acting in the same straight line. What's special about a couple is that the total torque of such forces is the same about whichever point we choose. It is given by
    [tex]G=Fd_{perp}[/tex] in which [itex]d_{perp}[/itex] is the perpendicular separation of the lines of action of the two forces. This is easy to show.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is the difference among moment, torque and couple?
  1. Moment of a couple (Replies: 1)

Loading...