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Homework Help: Sphere hoop

  1. Dec 28, 2011 #1
    a sphere and a hoop both of same mass (e.g. 'm') roll down an inclined plane without slipping...which will get to the bottom first..will they have equal kinetic energies when they reach the bottom?
  2. jcsd
  3. Dec 28, 2011 #2


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    Homework Helper

    This appears to be homework. If so, you're supposed to show some attempt at solving the problem.
  4. Dec 28, 2011 #3
    nope not hw..(i wish our hw wud have had such long deadlines)...some problems given in a book...and i post the ones, i cant approach..
  5. Dec 28, 2011 #4
    No... though both objects have the same potential Energy at t = 0s, they have different "moments of inertia" and since they are both rolling they have both kinetic and rotational Energy when they reach the bottom of the inclined plane. The hoop will be slower.

    Erot = 1/2 J ω²
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