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Some Help With My Ticker-Timer Experiment

  1. Oct 14, 2009 #1
    1. The problem statement, all variables and given/known data

    Hi, I recently preformed a ticker timer experiment in my grade 11 physics class, and I seem to be having a bit of trouble with the assignment.

    Our results were recorded as follows.

    Time (s)|Distance (cm)
    0|0
    0.1|6.15
    0.2|21.35
    0.3|43.15
    0.4|71.55

    I am supposed to create a d-t graph which I have done, and then create a v-t graph and a-t graph. I am having troubles getting from the d-t graph to the v-t graph. I am aware of using the tangents of each points, but I cannot seem to do this correctly, as my results are always incorrect. So I need to find a way to find the instantaneous velocity for each time segment, that way I can plot the v-t graph.

    2. Relevant equations

    I am not positive which equations can be used, other than the tangent method, but as I previously stated, I am doing this incorrectly and would greatly prefer an equation (if possible) for the instantaneous speed.


    3. The attempt at a solution

    I have tried finding the instantaneous velocity by using v = d/t (for example, v = 6.15/.1) but this does not work either because when plotted, the graph is always a curve.

    Also, if I were to calculate the acceleration from my results. Would I calculate the average velocity, then divide that by t2 - t1?

    Thanks for any help, it is greatly appreciated. Also, I am sorry if I used the template incorrectly, this is my first time posting here.

    -Adam
     
  2. jcsd
  3. Oct 14, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Hi Adam SE, welcome to PF.
    You have to draw the tangent at every point very accurately to get the correct v-t graph.
    If you are able to post, do so.
     
  4. Oct 14, 2009 #3
    Thank you for the response, it is appreciated.

    A problem I am having is accuracy, but the biggest problem I have is knowing when to stop the tangent. Do I stop it at the next time segment/axis, or do I stop it until it is enough to measure?

    -Adam
     
  5. Oct 14, 2009 #4

    rl.bhat

    User Avatar
    Homework Helper

    Draw until it touches the x-axis. Draw a perpendicular from the point to the x-axis and then find tanθ
     
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