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Calculating Work Done

  1. Aug 14, 2011 #1
    1. The problem statement, all variables and given/known data

    Calculate the work done on the crate during the journey

    2. Relevant equations

    WD=F*S

    3. The attempt at a solution

    I know its simple but im just double checking more than anything, the force pulling the crate is 482.96N and the distance is 20M.

    Now i would presume 482.96*20= 9659.2J

    My book however says that the force is the force we are opposing against so what force would this be?

    Thanks, Joe
     
  2. jcsd
  3. Aug 14, 2011 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Can you please post the full problem exactly as given.
     
  4. Aug 14, 2011 #3
    The first of these concerns the transport of crates
    across the floor of a factory. This is accomplished by using a drag line connected
    to an electric motor. Crates are hooked on to the line and dragged from one
    location within the factory to another across a series of rollers.

    the original problem was at :https://www.physicsforums.com/showthread.php?t=521477
    On there also has an image of what i mean since it wont let me upload it twice.

    I have currently calculated:

    horrizontal component acting on the crate
    the acceleration experienced by the crate
    the speed of the crate at the end of a 20m journey
    the kinetic energy of the crate at the end of the journey
    the duration of the journey

    It now wants the Work done on the crate during the journey

    If thats any better, Cheers
     
  5. Aug 14, 2011 #4

    Doc Al

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    Staff: Mentor

    You've calculated it correctly.
     
  6. Aug 14, 2011 #5
    Thankyou very much for your time and help
     
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