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Is Work done when there is constant velocity?

  1. Oct 7, 2013 #1
    1. The problem statement, all variables and given/known data
    "You carry your 14.0 kg bag of textbooks horizontally 1.8 m above the ground, at constant velocity for a distance of 25 m. Ignore wind resistance. How much work do you do on the bag in the process?"

    2. Relevant equations
    W=Fd
    F=ma


    3. The attempt at a solution
    If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?
     
  2. jcsd
  3. Oct 7, 2013 #2

    Doc Al

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    Staff: Mentor

    The net force on the bag is zero. But what force do you exert and what work does that force do?
     
  4. Oct 7, 2013 #3
    W=∫F.ds
    use that along with what Doc Al suggested.
    :wink:
     
  5. Oct 7, 2013 #4
    So is there only work being done in the vertical direction, aka. the force is takes you to physically hold the bag up?
     
  6. Oct 7, 2013 #5
    If there's displacement in that direction, yes. Work is proportional to displacement.
     
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