Answer by Jeff-Kesselman

http://docs.unity3d.com/Manual/InstantiatingPrefabs.html http://docs.unity3d.com/Manual/class-Rigidbody.html http://docs.unity3d.com/ScriptReference/Rigidbody-useGravity.html http://docs.unity3d.com/ScriptReference/MonoBehaviour.OnMouseDown.html