In a steady system the output energy scales based on the input energy. When there is feedback, the output adds/subtracts to the input, making it difficult to co

In a steady system the output energy scales based on the input energy. When there is feedback, the output adds/subtracts to the input, making it difficult to control the output with your inputs. Positive feedback adds to the input, making the output increase even as you attempt to reduce the input energy. Negative feedback subtracts from the input and forces you to increase your input energy to prevent the output from diminishing. Uncontrollable positive feedback explodes. Uncontrollable negative feedback freezes.