cristo, I know what you're saying and I knew how to calculate drag that way, but calculating the drag at a given velocity doesn't do me any good, it needs to be in a y= format for me to be able to graph it. I couldn't figure out how to derive that from just drag force.
Well I am not really shooting potatoes, they are frozen grapes, cut down to have a diameter of a half inch. The front of the grape is fairly rounded and sort of reduces on air resistance but I am looking at speeds well over 150 feet per second coming out of the barrel, higher speed in my opinion...
did it. Look how ridiculous this formula is.
m = mass
v = initial velocity
ø = angle
e = 2.71828182846
k = air constant
g = -9.81 m/s²(((m)(v)(sin(ø))/k)(1-e^(-((k)(t))/m)+(((m^2)(g))/(k^2))(1+(((k)(t))/m)-e^(-((k)(t))/m))
edit: it's wrong?!? I refuse to believe this is wrong after I spent all...
I got it from the bottom of
http://en.wikipedia.org/wiki/Trajectory_of_a_projectile
If you know of another formula for finding the trajectory of a projectile with gravity and air resistance then that would be great.
That didn't include drag and I am not using Excel, it will be an executable, written in C++. I know the formula for drag, but drag changes based on velocity, and the velocity is constantly changing.
http://upload.wikimedia.org/math/4/2/f/42fa657994ca819eccfcf2b36296ddf9.png
Sorry I can't display images on these forums.
That is the equation of finding the trajectory of a projectile with gravity and air resistance.
I know that
m = mass
vº = initial velocity
e = 2.71828
g = -9.81m/s²
What...
No, computers is how I intend to do this. I don't know a thing about differential equations, but I have been programming for years. I am making a program for doing it. I made one already that calculates the muzzle velocity and the maximum height of the projectile fired straight up in a vacuum...
I am trying to plot the trajectory of a projectile. I found formulas for finding the drag force, but it only gives me the drag force at an impossibly short interval of time, i need it to affect the trajectory of the projectile threw out it's path. The projectile is also affected by gravity. If...