Unity Physics

Physics System Overview

Unity provides different physics engine integrations for different project needs:

• 3D Physics (PhysX): Nvidia PhysX engine integration for 3D object-oriented projects
• 2D Physics (Box2D): Optimized 2D physics system with dedicated components
• Both systems simulate gravity, collisions, forces, and constraints

Physics Timing

Physics runs on a fixed timestep via FixedUpdate, separate from the rendering frame rate: