i want to create a tiny explosion with a pre-fractured box using metaballs and the magnet force. i want the explosion to be quite fast and rigid so i have started off with a scale force of -10000. I have key framed the scale force to bring it back down to 0 after a few frames in and effort to stop the explosion and let the fractured peices settle, however for some reason the fractured chunks just keep moving indefinitely. any help would be good.

You need to use Modify Data
http://www.sidefx.com/docs/houdini12.0/nodes/dop/modifydata [sidefx.com]

thank you very much, i will give it a try.