Hello,
I am trying to create a simple spring mass system. Therefore I'm using a baseplate, which I fix to the origin, a spring damper part and a mass on top. It's basically like in the sketch I added, just upside down.

I am able to fix the baseplate and the spring to the baseplate. But if I try to animate the whole model, the mass just falls off. I used a translational joint to fix the mass to the spring.
Thank you for your help!