Fine, but I didn't mean that. *time is working fine in the rest of my game. I just meant I don't know how to use *time (or *time_step) in physics.

Should I be doing add_force * time_step? I didn't think that worked?

I want my physics to not go crazy at the slightest lag. I don't know how. Should I lock the FPS? Should I use time_step? Can someone give me an example of physics movement on a marble that stays the same even though the frame rate dips?