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B Acceleration for Position-time graphs

  1. Jun 29, 2016 #1
  2. jcsd
  3. Jun 29, 2016 #2


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    Staff: Mentor

    Acceleration is the second derivative of the position versus time... :smile:
  4. Jun 29, 2016 #3


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    Science Advisor

    Your question reversed the graphs?
    In the first graph, the slope is getting steeper, speed up.
    In the second graph, slope is getting less steep, slowing down.
  5. Jun 29, 2016 #4
    @berkeman Im sorry i dont understand how that relates to negative acceleration for the first and positive acceleration for the second:oldconfused:
  6. Jun 29, 2016 #5
    @mathman that is exactly what i mentioned above...
  7. Jun 29, 2016 #6


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    Staff Emeritus
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    Do you understand the difference between the 2nd derivative of y=x2 and y=-x2?

    Plot each of those two functions, and look at the nature of the curvature. One is curving UP, while the other is curving DOWN. So which one will give you a positive second derivative, and which one will give you a negative second derivative?

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