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Don't understand phrasing of Question

  1. Oct 15, 2009 #1
    Sorry if this is the wrong place to ask

    A helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end.

    Does that make sense to you?

    Not my question - a non-native-speaker friend asked me to explain the meaning of a few physics questions. I don't really understand the italicized part of this one though...
    Last edited: Oct 15, 2009
  2. jcsd
  3. Oct 15, 2009 #2


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    Basically, you lay the helical spring flat on the ground and spin it about one of its ends.
  4. Oct 15, 2009 #3
    So - a cylindrical spring is sitting upright on the ground. You grab the top most edge, then start moving your arm in a circular motion. Is that it? Or, is the cylindrical spring sitting in the same manner, and you just grab the top most coil then start rotating the spring?
    Last edited: Oct 15, 2009
  5. Oct 15, 2009 #4


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    Like this:

    http://images.absoluteastronomy.com/images/encyclopediaimages/m/mo/moment_of_inertia_rod_end.png [Broken]

    where the rod is the spring
    Last edited by a moderator: May 4, 2017
  6. Oct 16, 2009 #5
    Nor do I understand that png. Perhaps I'm just daft about this.
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