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Homework Help: Air Resistance project

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm trying to program a projectile motion program for my physics project. We are suppose to take account effects on air resistnace
    If our drag coefficient is 0.4 our mass is 0.14273kg(baseball) initial velocity is 20, and angle is 45. What would be the acceleration of x component and y component
    2. Relevant equations

    3. The attempt at a solution

    When i did ax=Fairx/mass i have a number in the 500's my ay= (fg+fairy)/m is really huge too:/

    WHne i say huge i mean hundreds huge. All i'm asking is is -550m/s^2 a normal acceleration due to air resistance >.>
    Last edited: Nov 21, 2009
  2. jcsd
  3. Nov 21, 2009 #2


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    Homework Helper

    It definitely isn't normal. How did you calculate Fair? It should be Cd*rho*A*v^2.
  4. Nov 21, 2009 #3
    for just Fair it is kv^2

    where k is initial velocity.(20) and k is 0.4(our given drag)
  5. Nov 22, 2009 #4


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    Staff Emeritus
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    Homework Helper

    Can you look up how drag coefficient is defined, either in your textbook or lecture notes? I think you are not using it correctly here.
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