Right, so you’re using add force. Personally, never use it, but I think it’s frame rate dependent. Basically, to avoid the problem you have to multiply by delta time, and the another correcting factor, because after using delta time, things will be too slow.
You can also test how it will run on different machines by changing your frame rate with the console command ‘t.maxfps 20’, for instance.
Here’s a link to someone asking something similar: