whats and example of negative feedback?

Answer 1

Negative feedback occurs when a change in one variable results in the opposite change another variable, which 'feeds back' to the original system, stabilizing it. In other words, negative feedback works to keep the system stable or at equilibrium. There are many examples of this, especially in physiology and ecology, but a simple example is that of human body temperature. When something happens that changes your body temperature (you go out in the sun, for example), then your body reacts to stabilize your temperature (you sweat). As your body temperature increased, your body started to sweat, which decreased your temperature until it was back to normal.

Answer 2

Robert A's answer is an example of positive feedback, the side effect is making the main process more extreme.

A possible example of negative feedback would be that increased amounts of carbon dioxide in the atmosphere stimulate the growth of more plants on land or algae in the ocean. These extra plants use up more carbon dioxide in photosynthesis and help return levels to what they were before.

(Whether this actually works depends on whether we allow the process to occur by not interfering.)

A much simpler example of negative feedback is a thermostat on a furnace. As the temperature in a room gets colder the thermostat detects the change and starts the furnace. When the room gets warmer the thermostat turns the furnace off.

Answer 3

Negative feedback is when something moves off a stable value consequential things happen to move it further away from its stable value. There is conjecture that negative feedback may be occurring with global atmospheric CO2 levels and global warming. Large areas of Siberia are losing permafrost and the decaying vegetation is releasing vast quantities of CO2 increasing global warming at an even more rapid rate.

Edited comment: As pointed out below this is a description of positive feedback, sorry for the error.

Answer 4

"Your website sucks." Or, "You're too fat." Or, "I hated this play you wrote." All good examples.