[ODE] RE: converting velocity to the equivalent force value?

[Megan Fox]

... I really, really should just write these equations out and work them by
hand - you'd think I'd have learned by now.  (was multiplying by time, not
dividing, resulting in broken math that needed a tweak value and making me
think ODE velocity wasn't what I expected)

Thanks :)

-Megan

> -----Original Message-----
> From: Jon Watte
> (and the magics of copy/paste'ing from the archives when your email
reception is apparently kaput)
>
> Let's ask Mr Basic Physics and see what he has to
> say (using vector math):
>
> new_velocity = old_velocity + acceleration * time
>
>
> "time" is your time step size.
> Solve for "acceleration":
>
> (new_velocity - old_velocity) / time = acceleration
>
> Now, we know that:
>
> acceleration = force / mass
>
> So:
>
> force = (new_velocity - old_velocity) * mass / time
>
> QED.
>
> Cheers,
>			/ h+