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Homework Help: Angular motion

  1. Nov 14, 2005 #1
    Hi Please I would like to have some help with this problem:
    A cylinder of mass .2 kg rolls without slipping down an inclined plane of 15 degree.
    What is its rotational kinetic energy after it rolls 80cm?

    I tried the formula W=Kf - Ko but It does not bring me to the solution.
    Thank you for our help
  2. jcsd
  3. Nov 14, 2005 #2


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    Use energy conservation and note that the cylinder has both translational and rotational kinetic energy. You'll need to use a little geometry to determine the change in elevation of the cylinder and don't forget to use the moment of inertia in your rotational KE calculation.
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