With out the Box Collider, the object would not be able to physically interact with its environment. All of the settings here are the default settings.
This also allows the crate to physically interact with its environment. The settings here are also the default values, but you can adjust them to make it more massive, to ignore gravity, or to be immovable.
This is the component that restricts our movement to our 2D plane. All settings are default except for the following four:
‣ ZMotion: Locked
‣ Angular XMotion: Locked
‣ Angular YMotion: Locked
‣ Configure in World Space: Checked
Pipeline, Mesh Filter, and Material
These assign the proper mesh and texture so it renders in the scene.