The NVIDIA PhysX physics engineA system that simulates aspects of physical systems so that objects can accelerate correctly and be affected by collisions, gravity and other forces. More info
See in Glossary used by Unity is available on iOSApple’s mobile operating system. More info
See in Glossary but the performance limits of the hardware will be reached more easily on mobile platforms than desktops.
Here are some tips for tuning physics to get better performance on iOS:-
The total amount of physics calculation depends on the number of non-sleeping rigid bodies and colliders in the sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary and the complexity of the colliders. You can keep track of how many physics objects there are in the scene using the internal profiler.