In this Unreal Engine 5.3 Niagara beginner tutorial, we kick off our Forces series by exploring the Acceleration Force module! Learn how coordinate spaces (World Space vs. Local Space) affect your particle movement, how acceleration compares directly to gravity, and how to control particle direction with 3D vectors. 
https://dev.epicgames.com/community/learning/tutorials/nOnWe/unreal-engine-ue5-3-niagara-basic-acceleration-force-34