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!

Dynamics Conservation of linear and angular momentum

  1. Jan 9, 2014 #1
    Attached file shows where my problem occurs. I understand how to get the angular momentum just before the collision. But what confuses me is is within the square. Why mvg(r) is only on the left hand side when ive had similar equations with it on both sides. Why is Ig used and why isnt Ib used for rotational energy since isnt the ω thats used is about Ib.
     

    Attached Files:

  2. jcsd
  3. Jan 9, 2014 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Dublin! :smile:
    You could use mvGr + IGωon the RHS also …

    but it's much simpler to use IAω ! :wink:
    erm … no, ω is the same about any point :smile:
     
  4. Jan 9, 2014 #3
    so why does mvr + Igw= Iaw? what is r suppose to represent? i thought it was just the distance of the mass center to the point of which the moment is being rotated about in this case Ia
     
    Last edited: Jan 9, 2014
  5. Jan 9, 2014 #4
    i think i figured it out thanks
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted