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Homework Help: Force - Time graph Question

  1. Dec 13, 2007 #1
    Hi everybody,

    I was given a set of physics problems and some of them ask us to find work. The problem is, we are given a force-time graph as opposed to a force-distance graph. My question was whether there was a way of finding work done using a force-time graph. I don't see how it could be done and i haven't found anywhere where you can do it but I have a feeling it can be done.

    Does anyone know? Please reply either if it can or can't be done...

    Thank you
  2. jcsd
  3. Dec 13, 2007 #2
    Not if the force and dt are the only info given...
  4. Dec 13, 2007 #3
    Sry, ignore my last post. Yes, you can.
  5. Dec 13, 2007 #4
    Sorry, how can you find it out?

    I tryed the area under the graph but that doesn't work
  6. Dec 13, 2007 #5
    Sorry, how can you find it out?

    I tried the area under the graph but that doesn't work
  7. Dec 14, 2007 #6
    What kind of force-time graphs are they? I'm guessing they're impulse graphs (large force over relatively short period of time); if so, you can assume the impulse approximation. What does this tell you about the work done (or more precisely, the distance traveled due to a force)?
  8. Dec 14, 2007 #7
    Yes, they are graphs with large forces over small amounts of time.

    I'm sorry but I can't see the connection between this graph and work and/or distance.

    If it helps, one of the questions talks about a railway engine of x mass moving from rest along a straight track. It then gives you the force-time graph.
  9. Dec 14, 2007 #8
    It's ok now...I've figured out the answer

    Thanks everyone for your help
  10. Sep 18, 2009 #9

    I have the same question as you. How did you find the work done using force - time graph?? Thanks.
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