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Unread 11-01-2006, 00:33
Tatsu Tatsu is offline
Audiophile and Physicist.
AKA: Tatsu Hashimoto
FRC #1072 (Harker Robotics Team)
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Join Date: Jan 2006
Rookie Year: 2004
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Re: Nerf ball starting at 12m/s 45 degree angle ending at 8ft 6in w/ air resistance

Oops the drag coefficient should be .416 not .5 .. the difference should be small, but I guess if you're picky, I'll go regenerate the table..

for anyone wanting to check my constants

.416 = Cd
1.29 kg/m^3 = rho
3.5^2 Pi = area (convert to meters)

so we get ..
Fdrag = v^2 * 0.00680265...

that wasn't so bad eh?
now just do some discrete modeling assuming a is constant over small intervals (deltat is .1 in this example.. smaller would be more accurate, but this is a rough estimate anyway, density isnt contant and spin effects would negate this..)

*edit* - I /shoud/ be cramming for my finals, but if I finish my final code, I'll paste the ballistics table here with variables v, vbot, theta... It shouldn't be that bad, once I'm done with that... I can take into account lateral air resistance (the list keeps going). I'll post them here when I'm done (hopefully after friday, my physics final =p )

*edit 2* - is someone with matca willing to lend some processing time? I realized that a delta t < .1 (ie .001) takes a ridiculously long time... if anyone is willing to help generate ballistics table, I'd be grateful..

Tatsu

Last edited by Tatsu : 11-01-2006 at 00:47.