Unity Physics System
As you have been creating objects (2D objects or 3D objects) you would have noticed that Unity has automatically included a type of “Collider”. This component contains half of the information of that object. But having just the object collider isn’t enough if we want to add any physics properties, this is where the “Rigidbody” comes in.
Unity comes preloaded with artificial gravity and is automatically turn on as default. Once you apply the Rigidbody component to any object and hit play you can see the objects fall into oblivion. There are several options to experiment with in the rigidbody settings, including the mass, which is how heavy the object is, Drag which calculates how much resistance the objects has. By clicking Kinematic, the object stays stills.