[Newton]NewtonBodyAddForce/Torque doesn't work ? How to use it ?

Hi, I'm new to newton. A few functions are working wonderfull like NewtonBodySetVelocity and NewtonBodySetOmega.
But I only need forces that additionally affects my object, a simple sphere. But with the same parameters as before with NewtonBodySetVelocity/Omega, the function NewtonBodyAddForce/Torque does nothing with the object.

So, maybe someone has an easy example of the right use of NewtonBodyAddForce/Torque (or similar functions), i didn`t found something suitable in the newton demos.