>On Thursday, June 27, 2002, at 12:57 PM, Peter Bancroft wrote:
>
>>> Can any of you geniuses provide an outline for creating a particle
>>> spewer?
>>>
>>>
>>> Particle goes up, perhaps with some angular vector amount toward one
>>> side
>>> or another , thus arcs over due to gravity, falls, then bounces a
>>> couple
>>> times..not big bounces...like a Sparkler.
>>
>> Sinusoids with a gravity component. Look for the mathematics of
>> trajectories of cannon balls or bullets.
>>
>> Peter
>>
>
>   Year 11 physics actually. They are actually parabolas. You break it
>into the x and y components.
>
>   X acceleration = 0
>   Y acceleration = -g (positive is up)
>
>   X velocity = k (constant (given by x component of the launch velocity))
>   Y velocity = -gt + C1 (integrate acceleration with respect to time)
>work out constant with initial conditions (t = 0, Y velocity = y
>component of launch velocity).
>
>   X position = kt + C2 (integrate velocity with respect to time) work
>out constant with initial conditions (position relative to origin at t =
>0)
>   Y position = (-g/2)*(t^2) + C1t + C3 (integrate velocity with respect
>to time) work out constant with initial conditions (position relative to
>origin at t = 0)
>
>   If there is acceleration in the x direction then you need to start
>with that and integrate up to the position. if you want X,Y coordinates
>you eliminate t in the position equations.
>
>   Hope this helps
>
>   Ashley ~)~


Thanks for the clarifications. I know it was similar , and there was a need
for a time factor but needed a breakdown. Different from the kind I am used
to. :)

Thankee.


rc