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Projectile motion with air friction

  1. Jun 27, 2012 #1
    I'm trying to understand the motion of projectile motion under the influence of air resistance. A website such as this details the necessary equations available to approximate this model: http://claymore.engineer.gvsu.edu/~michels/index_files/Golf%20Ball%20Paper%20Final%20draft.pdf [Broken]
    However, i am unable to calculate vaild results.
    I'm using the constant air friction equation
    x(t)=(24τV cosθ)/(C_D Re) e^(-((C_D Re)/24τ)t)+(24τV cosθ)/(C_D Re)
    &
    y(t)=〖(V sinθ+24τg/(C_D Re))( -24τ/(C_D Re) e^(-((C_D Re)/24τ)t) )+((V sinθ+24τ/(C_D Re))(24τ/(C_D Re)))-(24τ/(C_D Re))t

    Reading on the linked website will provide in detail what these variables equal.

    My results are
    Velocity:v=2.85ms
    Angle 60 degrees
    mass: 0.004kg
    Diameter: 0.016m
    This is all done in the fluid of air
    at around 20°C
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Jun 27, 2012 #2

    Simon Bridge

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    In what way are these not valid results?

    [aside: the link is not valid]
     
  4. Jun 28, 2012 #3
    Sorry what i'm meant to say is that my results are my initial values. When i sub these into the equation listed the results i obtain are invalid. Try the link again it should be vaild. If not just type into google search and click the most common url located
     
  5. Jun 28, 2012 #4

    Simon Bridge

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    However I now have the pdf linked to. Thanks.
     
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