Physics

The Physics Manager is responsible for looking after all of the running physics systems.
Phaser supports 4 physics systems: Arcade Physics, P2, Ninja Physics and Box2D via a commercial plugin.

Game Objects (such as Sprites) can only belong to 1 physics system, but you can have multiple systems active in a single game.

For example you could have P2 managing a polygon-built terrain landscape that an vehicle drives over, while it could be firing bullets that use the
faster (due to being much simpler) Arcade Physics system.