Colliding with a child articulation link seemingly generates less force than colliding with the base.

[ilyal451]

Hitting one place sends the articulation flying and hitting another one (another link) it doesn't even move..

The setup is pretty basic: the links are connected by a revolution joint, which has a velocity motor (which also has type eVELOCITY). Haven't checked with other setups. If I'll manage to make a snippet on the gear joint, I'll probably make a snippet on this one.