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Sliding, and rolling, w/ w/o friction

  1. Jan 18, 2007 #1
    Ok, I don't get this, when a sphere moves over a frictionless surface tilted downward so getting accelerated, does roll or slide?
  2. jcsd
  3. Jan 19, 2007 #2


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    Staff: Mentor

    If there's no friction, what force could cause it to roll?
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