[ODE] problem with adding forces

[Cyril Labordrie]

There is a lot of questions !!

All units must be un International Units System

As Martin Said

F = m a

F is the Force in Newton, Newton is equivalent to ML/T*T.

a = dv / dt

and v = d Pos / dt


to answer to your question, it depends on the mass of your body

If you consider a small timestep for exemple 1 sec, DT = 1s it is easier
to give you an idea.

DPos  = Dv * 1
	= Da * 1

then DPos = F / m

if M is Greater than F it is normal it does not move.

Cyril





-----Message d'origine-----
De : ode-admin@q12.org [mailto:ode-admin@q12.org] De la part de Martin
C. Martin
Envoyé : jeudi 7 août 2003 00:31
À : lazareer
Cc : ode@q12.org
Objet : Re: [ODE] problem with adding forces

F = m a

- Martin

lazareer wrote:
> 
> Wednesday, August 6, 2003, 10:11:08 PM, lazareer wrote:
> 
> l>> I am new on this list, and maybe my question is silly and
> l>> the answer is obvious but I will ask it anyway:
> l>> I've  got  problem  when  I add force to the body (dBodyAddForce).
The
> l>> force  is  added  (dBodyGetForce returs correct vector)but it
takes no
> l>> effects  in  the  simulation  step.  If  there  is no gravity the
body
> l>> doesn't move. Why? has someone any explanation? maybe someone had
such
> l>> a problem?
> l>> Thanks for any ideas!
> 
> ok I've found the reason of my problem - force vector was too small to
> make effect, but I've got another question due to this: what are your
> experiences of using forces? do you really have to put force vector
> like: (10000,0,0) to see anything moving? What are the units of force
> vectors?
> 
> lazareer
> 
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