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: Equations for tension?

  1. Jan 3, 2005 #1
    My physics book sucks and I cant find the equation for tension in a string, can some one tell me the equation?
  2. jcsd
  3. Jan 3, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    What kind of string??Is it one which oscillates,in which mechanical waves propagate??If so,then it should be
    [tex]T=m\frac{\partial^{2}u(x,t)}{\partial t^{2}} [/tex]
    ,where "u" is the amplitude of the wave which propagates along the "x" axis,or it is the coordinate "y" of a point on the string at point "x" at the moment "t".

  4. Jan 3, 2005 #3


    User Avatar
    Science Advisor

    Or, if the string is massless, hanging from a support and supporting a weight W, then the tension at every point in the string is W. (Your text may have thought you didn't need a formula for that!)

    If the string has weight density μ and is supporting weight W, the the tension at a point a distance x above the weight is μx+ W, the total weight below the point.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook