Unity Physics :

Rigidbody:

Rigidbody for 2d objects.
Rigidbody for 3d objects.

Colliders:

BoxCollider for 2d with objects box shape.

Triggers:

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store