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Homework Help: Easy Questions - Plz Help

  1. Mar 16, 2005 #1
    :confused: what is the physical meaning of the sign of the area under a velocity v. time graph (displacement) ??

    what is the physical meaning of the sign of the area under a acceleration
    v. time graph (velocity) ??

    :confused:
    plz help me
     
    Last edited: Mar 16, 2005
  2. jcsd
  3. Mar 16, 2005 #2

    HallsofIvy

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    I'm not quite sure what you mean: area is always positive. Assuming you mean "signed" area (a bit of a strange terminology), the area under the velocity v time graph is "displacement"- distance moved. If that is positive, then you have moved in the positive direction, if negative you have moved in the negative direction.

    "Area" under the acceleration v time graph is change in speed. If that is positive, speed has increased, if negative, speed has decreased.
     
  4. Mar 16, 2005 #3
    ok i see, but lets say we have negitive displacement, does that mean the "area" would be graphed below the x-axis on a graph ?
     
  5. Mar 16, 2005 #4

    xanthym

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    Yes, because velocity "v" would be negative ("under the x-axis"), and the integral would yield a negative value (or "area") for displacement.


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