Adding to the physics in unity topic we have two methods we can call that effect our game objects. In my previous example i used OnTriggerEnter Which activated the destroy game object instruction. this works because both objects have colliders components attached. in the unity documentation is it explained like: Both GameObjects must contain a Collider component. One must have Collider.isTrigger enabled, and contain a Rigidbody. If both GameObjects have Collider.isTrigger enabled, no collision happens. The same applies when both GameObjects do not have a Rigidbody component.