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!

Kinetic Energy of a flat uniform disk

  1. Nov 7, 2008 #1
    1. The problem statement, all variables and given/known data

    A flat, uniform, disk, of radius 1.5 m and mass 10 kg, is rolling on its edge with a translational velocity of 12 m/s.
    What is the kinetic energy of the disk?

    2. Relevant equations

    not sure which one but I'm guessing it's one of these two:
    K = .5(I)(w)^2
    K = .5(Icm)(w)^2 + .5(M)(v)^2cm

    3. The attempt at a solution

    I have absolutely no idea how to even start this problem, any help on what eqn to use and what I is would be extremely helpful
  2. jcsd
  3. Nov 7, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    For a rolling object - the total energy is the kinetic energy of the moving mass PLUS the rotational energy.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?