Sorry for necro’ing, but this thread was very helpful.
The documentation from Epic (Units of Measurement in Unreal Engine | Unreal Engine 5.5 Documentation | Epic Developer Community) mentioned Newtons for their unit of Force. But after testing values, it should be centiNewtons.
Unreal allows you to change units via the Project Settings (it modifies DefaultEditor.ini). Even though I’ve changed acceleration to m/s^2 and force to N, it didn’t seem to affect AddForce(). If anyone knows why, please let me know. Thanks.