How to model physics in Blender? I'm robotic engineer. I'm using OpenSCAD to model robotic components (gears, pulleys, parts, etc). But I need application to model physics and interaction of the components (for i.e. how will robot move if I will rotate current gear).

So, is it possible to import OpenSCAD models into Blender and model interactions in it?

I have models in STL format (for i.e. gears). I need to make reductor from it and see how it moves (if possible - measure rotation speed and torque).
Blender supports some physics simulation for rigid bodies, soft bodies, cloth and fluids. However these are not aimed at CAD applications, there are no tools to measure things like rotation speed and torque, and there is no guarantee that the simulation results will match the real world to some precision.

I think you need to use specialised CAD/CAM software for this.