The NVIDIA PhysX physics engine used by Unity is available on iOS 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 scene and the complexity of the colliders. You can keep track of how many physics objects there are in the scene using the internal profiler.
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