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Velocity graph (reverse direction)

  1. Sep 15, 2011 #1
    please explain to me about reverse direction. dont just give me an aswer :) thanks.

    Consider the velocity vs. time graph shown here. focusing on the issue of whether the object turns around (reverese direction)

    Velocity
    |
    | (TRIANGLE HERE)___time

    a. why might a smart student say the object reverse direction?

    b. why might a smart student say the object doesn't reverse direction?

    c. does the object reverse direction? as part of your explanation, explain why the other argument is incorrect, and give advice to someone who made that mistake that can help them understand why they made the mistake and how they can avoid it in the future.
     
  2. jcsd
  3. Sep 15, 2011 #2

    PeterO

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    if an object reverses direction, then its velocity will be positive at some time, and negative at a later/earlier time. It will also be zero in between those two times.
    Pretty hard to refer to you situation as I can't see if the (TRIANGLE HERE) is entirely above the time axis, entirely below the time axis or partially each????
     
  4. Sep 15, 2011 #3
    this is the link of the worksheet its on page 4 (HW2-4) question A, b, c. the graph is on the side.
    http://panda.unm.edu/Courses/Saul/Physics1/Tutorials/02_V_and_A_Graph_Tutorial_HW.pdf [Broken]

    thanks for your help in advance.
     
    Last edited by a moderator: May 5, 2017
  5. Sep 15, 2011 #4

    PeterO

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    That link doesn't work. It doesn't even look complete.
     
    Last edited by a moderator: May 5, 2017
  6. Sep 15, 2011 #5
    http://panda.unm.edu/Courses/Saul/Physics1/Tutorials/02_V_and_A_Graph_Tutorial_HW.pdf [Broken]

    yea i just realized it.. here it is again. sorry about that
     
    Last edited by a moderator: May 5, 2017
  7. Sep 16, 2011 #6

    PeterO

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    My first explanation of how you determine whether an object changed direction should be sufficient.
     
    Last edited by a moderator: May 5, 2017
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