1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Air resistance calculations

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm trying to find the acceleration due to air resistance in x direction and acceleration due to air resistance +gravity in y component.

    given variables
    m-0.14273(baseball)
    Cd=0.4
    Vi=20m/s
    angle= 45 degrees

    Basically, I have to program a projectile motion program accounting air resistance, but my biggest problem physics wise is my huge ax, and y acceleration, which prevent my program to loop even more:/

    2. Relevant equations
    ax= fairx/mass = -cdVix^2/mass
    ay= fairy+fg


    3. The attempt at a solution

    fairx= (0.4)(20cos45)^2=80N
    ax= 80n/0.14263kg = 560.498844m/s^2
    ay = well....its in the thousands >.>


    does this mean i have to assume f=Cd*V instead of being proportional to V^2?
     
    Last edited: Nov 22, 2009
  2. jcsd
  3. Nov 22, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi hallowon! :smile:
    No, that can't be right …

    a is L/T2, and the RHS is L2/T2 :confused:

    you need an extra factor with dimensions 1/length (or area/volume).

    Maybe this will help … http://en.wikipedia.org/wiki/Drag_coefficient" [Broken]
     
    Last edited by a moderator: May 4, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Air resistance calculations
  1. Calculating resistance (Replies: 2)

Loading...