How do you implement physics in Unity?

Implementing physics in Unity primarily involves the use of Rigidbodies and colliders on GameObjects. Rigidbodies enable an object to react to physics forces such as gravity and collisions, allowing for realistic movement and interaction with other physical objects in the game world. When a Rigidbody component is attached to an object, Unity's physics engine automatically calculates movement based on forces applied to it and allows physics-based interactions.

Colliders, on the other hand, define the shape of an object for the purpose of physical collision detection. Without colliders, Rigidbodies would not register collisions with other objects in the scene, rendering the physics interactions ineffective. By combining Rigidbodies and colliders, developers can create a robust physics system that accurately simulates real-world physics behavior, making it easier to create dynamic and engaging gameplay experiences.

While applying forces manually in scripts, setting up physics materials, and defining physics zones can complement the implementation of physics, the foundational approach relies on properly using Rigidbodies and colliders. This is essential for enabling interactions that are central to the physics-based dynamics of a game.