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Rotating around axis question

  1. Nov 27, 2011 #1
    Look at picture for more details....

    Book says.....
    " A body is free to rotate only about the z-axis. Within the body any particle of
    mass m can move only in a plane parallel to the xy plane."

    What would the xy plane look like? I am assuming by "xy plane" this does not mean x and y axis...?

    I added a picture of what I think they are talking about... is this correct??

    Attached Files:

  2. jcsd
  3. Nov 27, 2011 #2


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    The xy-plane is the 2D coordinate plane formed by the x- and y-axes. In other words, it is the set of all points for which z = 0.
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