Having physics in your game improves the immersion value of every scene because it helps players believe that they are interacting with the simulation and that it is responding in some way. To enhance player immersion, Unreal Engine uses PhysX by default to drive its physical simulation calculations and to perform all collision calculations. The Physics engine subsystem performs accurate collision detection and simulates physical interactions between objects within the world.
Essentials
Clothing Tools
Vehicles
Content Creation
Chaos Physics
Chaos Physics is currently in Beta release.