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!

Homework Help: The physical pendulum - mass calculations

  1. Aug 16, 2013 #1
    When analysing the forces/energy transfers acting on a physical pendulum (albeit with a larger mass on the end, such as a grandfather clock...with a thick rod?) is it absolutely necessary to know the mass of the 'arm' (separate from the bob, as such)? Also, can the mass of the arm be calculated (or at least estimated) if the period, length of the arm and mass of the bob are known?
  2. jcsd
  3. Aug 16, 2013 #2
    It is not the mass that you really need to know, but the moment of inertia.
  4. Aug 16, 2013 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Certainly, if you assume the arm is uniform and the bob is small enough to treat as a point (or has a calculable MI).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted