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Difference between different kinds of motions of a rigid body

  1. Dec 8, 2011 #1
    i want to know what the difference between general plane motion and rotation about fixed axis is?

    im using their formulas for work and energy study and as far as i see their general equations are the same.

    how do i identify which is which.

    also in a disk with planar motion, is the instantaneous centre ALWAYS where the disk touches the ground?
    please help!!

    i have a specific example which is confusing me but it is an example in my book i dont know how to bring it up online so you guys can help me??
    any suggestions?
    Last edited: Dec 8, 2011
  2. jcsd
  3. Dec 8, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Maybe you can scan it and upload it. Or just describe it carefully.
  4. Dec 8, 2011 #3
    i will do that. but would you be able to explain the difference between the two motions?
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