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Homework Help: Work Performed

  1. Mar 9, 2005 #1
    A 20.0kg suitcase is dragged horizontally on a flat floor by a passenger at a constant velocity for 15m. The coefficent of kinetic friction is .340.

    What is the work done by the passenger?

    I've been trying to do W = FD
    F = ma

    But it says constant veloctiy, which throws me off. Constant veloocity means no acceleration right? I'm lost. Thanks in advance.
     
  2. jcsd
  3. Mar 9, 2005 #2
    I think I get it actaully. It's werid. I post a question here and even before I get a response things start making sense.

    I did, F - frictionForce = ma. Since a = 0, the F = frictionForce.

    So, W = coeff of friction * mass * gravity * distance. Would that be correct?
     
  4. Mar 9, 2005 #3
    Yep, sounds ok. Constant velocity indeed means no acceleration, which means that there's no resultant force (i.e. the forces balance, as you've done).
     
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