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Draw graphs?

  1. Nov 24, 2009 #1
    Draw graphs??

    1. The problem statement, all variables and given/known data

    A stone of a mass of 5kg drops through a distance of 15m under the influence of gravity. Draw graphs of the work done by the stone and the power of the stone as a function of time. Discuss your results.

    2. Relevant equations

    Work=(force)(displacement)
    Power=(work)/(time) or Power=(Force)(velocity)



    3. The attempt at a solution

    Ok, so I solved for work
    work= (5kg)(9.8m/s^2)(15m)=735J
    I don't know what to do now. I would think I need to plot Force on the Y axis, and displacement on the X axis, but I'm not sure.
    I'm having the same issue with the second graph
    Power=(735J)/(??) The problem says to graph power of the stone as a function of time, so i'm guesing I have to use the power equation that involves time. Can I use Power=(Force)(velocity)? I'm so confused! Help please!
     
  2. jcsd
  3. Nov 24, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Re: Draw graphs??

    Look at this problem from the point of view of energy. What can you say about the total energy (potential + kinetic) at all times? How does the potential energy change with distance? With time? (how does distance fallen or y position change with time?). Using this can you determine the change in kinetic energy as a function of distance and time?

    AM
     
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