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: Damping constant.

  1. Sep 18, 2006 #1
    How do I find the damping constant of a pendulum? Is there a formula?
     
  2. jcsd
  3. Sep 18, 2006 #2

    berkeman

    User Avatar

    Staff: Mentor

    I'd assume that you start with the equations of motion for an undamped pendulum, and then add in a retarding force that increases with angular velocity. Are you familiar with how to derive the equation of motion of a pendulum from the length and the mass?
     
  4. Sep 18, 2006 #3
    No, all I know is how to find its period.
     
  5. Sep 18, 2006 #4
    you need to work with linear differiential equations. you can have linear drag or quadratic drag (then it will be nonlinear). i suggest you learn some projectiles motions involving air resistance first if all you know is the formula for the period....
     
  6. Sep 18, 2006 #5
    Can someone please give me the equation with length and mass? I'll try to derive it.
     
    Last edited: Sep 18, 2006
  7. Sep 19, 2006 #6

    berkeman

    User Avatar

    Staff: Mentor

    We don't give out answers here in the PF. We guide:

    http://en.wikipedia.org/wiki/Pendulum
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook