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jk_16 Group Title

in air resistance (drag) is acceleration constant??

  • 2 years ago
  • 2 years ago

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  1. alexray19 Group Title
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    Yes, it is a force. But its magnitude, direction, behavior, etc is a function of several other variables related to the nature of the object experiencing the resistance (e.g. its shape, velocity, its environment, the properties of the air, etc).

    • 2 years ago
  2. vf321 Group Title
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    What do you mean? Acceleration has no influence on drag force, so \(\frac{dF_{drag}}{da}=0\) , but it has an influence on the acceleration since it's a force.

    • 2 years ago
  3. vf321 Group Title
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    ***Instantaneous acc has no influence on drag

    • 2 years ago
  4. alexray19 Group Title
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    Assuming ceteris paribus, as an object travels at a constant velocity in a straight line through non-turbulent air, it experiences a constant acceleration backwards caused by the air.

    • 2 years ago
  5. jk_16 Group Title
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    the grap of a v-t system under the influence of air resistance..is not a constant v(t)

    • 2 years ago
  6. vf321 Group Title
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    grap?

    • 2 years ago
  7. alexray19 Group Title
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    That is, in order to maintain constant velocity, the object must constantly be accelerating forward with a force equal but opposite to the force caused by the air resistance. It's like driving your car at high speeds; you have to constantly give it some gas to maintain your velocity, which is goes against Newton's law that an object in motion remains in motion. The resistance caused by air (and internal friction) accounts for this need to constantly accelerate the car.

    • 2 years ago
  8. vf321 Group Title
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    If an object is ONLY encountering drag, \[F = \frac{1}{2}cAv^2\]\[m a = \frac{1}{2}cAv^2\]\[k=.5cA/m; \frac{d v}{dt}=kv^2\]

    • 2 years ago
  9. jk_16 Group Title
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    @vf321 where did you get the initial F=1/2 cAv^2 from

    • 2 years ago
  10. vf321 Group Title
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    That's the formula for drag, if I remember correctly.

    • 2 years ago
  11. jk_16 Group Title
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    how do i derive it?

    • 2 years ago
  12. vf321 Group Title
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    derive what

    • 2 years ago
  13. jk_16 Group Title
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    F=12cAv2 ma=12cAv2 k=.5cA/m;dvdt=kv2

    • 2 years ago
  14. vf321 Group Title
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    Well u just did it...

    • 2 years ago
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