1. Not finding help here? Sign up for a free 30min 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!

Pendulum homework problem help

  1. Dec 6, 2009 #1
    original pendulum of mass 11 kg with a period of 1.6 sec, displaced an angle of 12 degrees from the vertical. What would its acceleration be in the vertical (y) direction as it reachs the lowest point on its swing?

    wouldn't it just be -9.8? (since its just the force of gravity acting on it)
     
  2. jcsd
  3. Dec 6, 2009 #2
    Re: Pendulum

    It is a pendulum, which means it is attached by a rod or string. In either event, what does that do to the force of gravity at the low point?
     
  4. Dec 6, 2009 #3
    Re: Pendulum

    umm...not sure...
     
  5. Dec 6, 2009 #4
    Re: Pendulum

    Well if you look at the free body diagram the tension in the rod cancels out the force of gravity.
     
  6. Dec 6, 2009 #5
    Re: Pendulum

    ok so its just zero
     
  7. Dec 6, 2009 #6
    Re: Pendulum

    yep.
     
  8. Dec 6, 2009 #7
    Re: Pendulum

    you need more information to solve the problem. you need to know the tension in the rod or string that's supporting the pendulum. Then you will be able to solve the eqn
    ΣF=ma=mg-T Cos θ
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Pendulum homework problem help
Loading...