Acceleration and Velocity functions for C++? - Overclock.net

SoaDMTGguy · 01-18-08

I am trying to write a C++ program that will uses acceleration and time to calculate velocity and position. Is there a library of functions that I could include to do these calculations for me, or will I have to write my own functions to calculate position and velocity in relation to acceleration and time?

Safetydan · 01-21-08

I don't know of any standardized physics libraries for c++, at least none outside of physics engines intended for games and such.

There are probably some homebrew libraries out there that you could use (I generally just google what I'm looking for to find that sort of thing) but it would also be pretty easy to make your own if all you need is basic acceleration/velocity stuff.

The Bartender Paradox · 01-21-08

I don't know C++ that well, but Going from acceleration and time to velocity and position are just a couple of simple algebraic equations in one dimension, and its not that hard to expand it to three. If your inputs for accel and time are just two numbers, then, assuming that both position and velocity are initially at 0:

Velocity = Acceleration * Time
Position= 1/2 * acceleration * (Time^2)

If velocity and position are not initially 0 then

Velocity = (Acceleration * Time) + InitialVelocity
Position= (1/2 * acceleration * (Time^2)) + (InitialVelocity * Time) + InitialPos

ninjinsamax3 · 01-27-08

I can write it with Java, but it should be similar, so maybe you can translate it and TBP already gave the formulas already.

Acceleration = Change of Velocity / Change of Time
With this, you cannot be wrong, so then you don't have to think about any other possibilities.

I think you need to write your own functions for it. If you need help, I can help you. C++ is similar to Java, so I know I can help you there. It might be annoying, since if there are no constants for each of them, you'll have to make the program a little more complicated though. Since you could be finding acceleration, velocity, or time.

Licht · 01-27-08

Quote:

Originally Posted by The Bartender Paradox

I don't know C++ that well, but Going from acceleration and time to velocity and position are just a couple of simple algebraic equations in one dimension, and its not that hard to expand it to three. If your inputs for accel and time are just two numbers, then, assuming that both position and velocity are initially at 0:

Velocity = Acceleration * Time
Position= 1/2 * acceleration * (Time^2)

If velocity and position are not initially 0 then

Velocity = (Acceleration * Time) + InitialVelocity
Position= (1/2 * acceleration * (Time^2)) + (InitialVelocity * Time) + InitialPos

Like he said man it isn't like its hard to make your own functions for this kind of thing.

C-bro · 01-30-08

All you have to do is make two methods for each one. They'll both have the same name, but can take in different inputs (known as polymorphism).

Code:

 // this method would compute the case of v0 = 0
double[] findPosition(double time, double acceleration){

}

//this method would take care of the other case
double[] findPosition(double time, double acceleration, double initialPos, double intialVelocity){

}

All you do is fill in those program segments with your formulas, and return the result as an array with the first element being velocity and second element being position. You also don't have to worry about the methods having the same name, because the computer will know which method to call depending on your inputs.

mirunit · 01-31-08

http://www.mathtools.net/C_C__/Calculus/index.html

Try that, you should be able to take the derivatives / integrals.

f(x) = pos.
f'(x) = vel.
f''(x) = acc.

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Acceleration and Velocity functions for C++?

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