Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
Don't panic!* Morten Dam Jørgensen - Computerfysik.dk
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⇢<br />
~v<br />
Cd<br />
A<br />
~Fdrag = 1<br />
Densitet af mediet (luft)<br />
2 ⇢~v2 CdA<br />
Hastigheden af legemet relativt til mediet<br />
Drag koefficient (dimensionsløs)<br />
Tværsnittet af objektet i bevægelsesretningen<br />
http://en.wikipedia.org/wiki/Drag_(physics)<br />
Fdrag(vn) =madrag(vn)<br />
adrag(vn) =Fdrag(vn)/m<br />
vdrag = tF(v)/m<br />
vtyngde = tg<br />
vn+1 = vn + vdrag + vtyngde<br />
Frit fald<br />
g = -9.8;<br />
y0 = 100; v0 = 0; % start<br />
y = y0; v = v0; % sæt start<br />
m = 1; % masse af objekt<br />
rho = 0.1; C_d = 1.2; A = 1;<br />
t = 0; dt = 0.1; % tid<br />
while y > 0 % stop ved y=0<br />
t = t + dt;<br />
y = y + v .* dt;<br />
end<br />
dv_g = g .* dt;<br />
dv_d = dt./m .* ...<br />
(0.5*rho* v^2*C_d*A);<br />
v = v + dv_g + dv_d<br />
plot(t,y,'b+')
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