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Homework Help: Acceleration - time graphs

  1. May 7, 2006 #1
    A 2,0 kg body moves along a straight line.

    bilde.gif

    x={0,2,4,6,8,10,12,14,16,18,20} s
    f(x)={10,10,20,30,50,50,50,20,10,5,0} m/s


    a)
    Make a acceleration-time graph

    c)
    Calculate the average force working on this body
     
  2. jcsd
  3. May 7, 2006 #2
    I tried to make a acceleration graph. However, something is wrong with it.

    ww.png


    c) First I tried to find the average acceleration,

    a = ((v - v0)/(t-t1)) = (0 m/s - 10 m/s)/(20-0)) = -0,5 m/s^2

    then

    E = ma

    = 2 kg * -0,5 m/s^2

    = - 1 N


    Can anyone correct me?
     
  4. May 7, 2006 #3

    Hootenanny

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    Gold Member

    From the data given, both your graphs and calculations are correct. Why do you believe it be wrong?

    ~H
     
  5. May 7, 2006 #4
    Ok. It is - 1 N, and not 1 N?
     
  6. May 7, 2006 #5

    Hootenanny

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    Staff Emeritus
    Science Advisor
    Gold Member

    Yes, it is -1N from the given data.

    ~H
     
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