Negative feedback - Revision history

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energy>Ethan.boechler at 20:51, 10 September 2021

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	[[Category:Done 2020-02-29]]		[[Category:Done 2020-02-29]]
			[[Category:Translated to French]]
			[[fr:Rétroaction négative]]
	[[File:Negative_feedback_general.png\|350px\|right\|thumb\|Figure 1. A flow chart to show the general process of some negative feedback, with an initial "push" to the system causing other effects that keep the system in its original state.<ref name=im>''Created internally by a member of the Energy Education team.''</ref>]]		[[File:Negative_feedback_general.png\|350px\|right\|thumb\|Figure 1. A flow chart to show the general process of some negative feedback, with an initial "push" to the system causing other effects that keep the system in its original state.<ref name=im>''Created internally by a member of the Energy Education team.''</ref>]]
	<onlyinclude>'''Negative feedback''' is a process that minimizes or reduces some initial effect, generally some disturbance causes some secondary effect that in turn minimizes the magnitude of the initial disturbance. This causes some initial change to grow smaller, keeping the system from moving out of its equilibrium state.</onlyinclude> The flow chart shown in Figure 1 can be used to clarify how exactly these changes occur, how they are connected, and how they result in an overall decrease of some initial effect. Note that every time the cycle repeats the effect gets weaker. The word 'negative' doesn't mean this is a ''bad'' feedback, it means that it's pointing in the opposite direction as the initial change (like a negative sign, which is where the term comes from).		<onlyinclude>'''Negative feedback''' is a process that minimizes or reduces some initial effect, generally some disturbance causes some secondary effect that in turn minimizes the magnitude of the initial disturbance. This causes some initial change to grow smaller, keeping the system from moving out of its equilibrium state.</onlyinclude> The flow chart shown in Figure 1 can be used to clarify how exactly these changes occur, how they are connected, and how they result in an overall decrease of some initial effect. Note that every time the cycle repeats the effect gets weaker. The word 'negative' doesn't mean this is a ''bad'' feedback, it means that it's pointing in the opposite direction as the initial change (like a negative sign, which is where the term comes from).

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energy>Jmdonev at 00:10, 19 February 2020

2020-02-19T00:10:05Z

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	[[Category:Done ~~2016~~-01-15]]		[[Category:Done 2020-02-29]]
	<onlyinclude>'''Negative feedback''' is a process that minimizes or reduces some initial effect, generally some disturbance causes some secondary effect that in turn minimizes the magnitude of the initial disturbance. This causes some initial change to grow smaller, keeping the system from moving out of its equilibrium state.</onlyinclude> The flow chart shown in Figure 1 can be used to clarify how exactly these changes occur, how they are connected, and how they result in an overall decrease of some initial effect.		[[File:Negative_feedback_general.png\|350px\|right\|thumb\|Figure 1. A flow chart to show the general process of some negative feedback, with an initial "push" to the system causing other effects that keep the system in its original state.<ref name=im>''Created internally by a member of the Energy Education team.''</ref>]]
			<onlyinclude>'''Negative feedback''' is a process that minimizes or reduces some initial effect, generally some disturbance causes some secondary effect that in turn minimizes the magnitude of the initial disturbance. This causes some initial change to grow smaller, keeping the system from moving out of its equilibrium state.</onlyinclude> The flow chart shown in Figure 1 can be used to clarify how exactly these changes occur, how they are connected, and how they result in an overall decrease of some initial effect. Note that every time the cycle repeats the effect gets weaker. The word 'negative' doesn't mean this is a ''bad'' feedback, it means that it's pointing in the opposite direction as the initial change (like a negative sign, which is where the term comes from).

	[[File:negativefeedbackloop1.png\|400px\|center\|framed\|Figure 1. A flow chart to show the general process of some negative feedback, with an initial "push" to the system causing other effects that keep the system in its original state.<ref name=im>''Created internally by a member of the Energy Education team.''</ref>]]

	From Figure 1, the explanation of what a negative feedback is can be simplified. Essentially, it is some initial push being applied to a system, creating some effect A. This effect can then change some properties throughout the system that then produces some later effect B, which may continue to change properties of the system. Eventually, the effect B then reduces the severity of the initial effect A. This pushes a system back into equilibrium after some disturbance. There are numerous examples of negative feedback in mechanics, in the human body, and in nature. Additionally, the concept of [[negative climate feedback]]s are important in understanding [[climate change]].		From Figure 1, the explanation of what a negative feedback is can be simplified. Essentially, it is some initial push being applied to a system, creating some effect A. This effect can then change some properties throughout the system that then produces some later effect B, which may continue to change properties of the system. Eventually, the effect B then reduces the severity of the initial effect A. This pushes a system back into equilibrium after some disturbance. There are numerous examples of negative feedback in mechanics, in the human body, and in nature. Additionally, the concept of [[negative climate feedback]]s are important in understanding [[climate change]].

	==Examples of Negative Feedback==		==Examples of Negative Feedback==
	To simplify what this idea of a negative feedback actually means, it sometimes helps to approach the concept in a variety of different contexts. A negative feedback that can be simple to understand is the way that the body cools itself. As internal body temperature rises sweat is produced. The sweat then evaporates, cooling the skin and returning the body temperature to a more manageable level.<ref name="RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>

	In mechanical systems, the motion of a spring can be seen as a negative feedback. When a spring is compressed and released, it will return to its initial shape after the [[force]] on it is gone. The tendency of the spring is to move back to its equilibrium position after being compressed.<ref name=ex>Your Dictionary. (November 3, 2015). ''Examples of Negative Feedback'' [Online]. Available: http://examples.yourdictionary.com/examples-of-negative-feedback.html#whSyCiHpM4VDyyxy.99</ref>		[[File:Cloud_negative_feedback.png\|350px\|left\|thumb\|Figure 2. A flow chart showing the one of the most significant negative feedback loops in the climate system - the cloud negative feedback.<ref name=im/>]]

			To simplify what this idea of a negative feedback actually means, it sometimes helps to approach the concept in a variety of different contexts. Some examples of negative feedback loops that are simple to understand are:
			*The way that the body cools itself. As internal body temperature rises sweat is produced. The sweat then evaporates, cooling the skin and returning the body temperature to a more manageable level.<ref name="RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>

			*In mechanical systems, the motion of a spring can be seen as a negative feedback. When a spring is compressed and released, it will return to its initial shape after the [[force]] on it is gone. The tendency of the spring is to move back to its equilibrium position after being compressed.<ref name=ex>Your Dictionary. (November 3, 2015). ''Examples of Negative Feedback'' [Online]. Available: http://examples.yourdictionary.com/examples-of-negative-feedback.html#whSyCiHpM4VDyyxy.99</ref>

			*As well, when a student receives a test back where incorrect answers have been marked, it is a type of negative feedback. By seeing which questions were done incorrectly, the student determines how to do the problems correctly and the questions will be done correctly on the next test.


	As well, when a student receives a test back where incorrect answers have been marked, it is a type of negative feedback. By seeing which questions were done incorrectly, the student determines how to do the problems correctly and the questions will be done correctly on the next test.

	[[File:negativefeedbackloop2.png\|400px\|center\|framed\|Figure 2. A flow chart showing the one of the most significant negative feedback loops in the climate system - the cloud negative feedback.<ref name=im/>]]

	One example of a negative feedback in the climate is the formation of [[cloud]]s - and corresponding reduction in [[solar radiation]] absorption. This cloud feedback is outlined in Figure 2, and is one of the most important negative feedbacks in the climate system. As the surface [[temperature]] of the Earth increases there are increased levels of [[evaporation]] from the [[ocean]]s. This increased evaporation results in more clouds forming in the lower [[atmosphere]]. These clouds in turn reflect some incident solar radiation back into space, slightly decreasing the surface temperature, reducing the number of clouds.<ref>Southwest Climate Change Network. (October 10, 2015). ''Negative Feedback Cycle'' [Online]. Available: http://www.southwestclimatechange.org/figures/feedback_cycles</ref>		One example of a negative feedback in the climate is the formation of [[cloud]]s - and corresponding reduction in [[solar radiation]] absorption. This cloud feedback is outlined in Figure 2, and is one of the most important negative feedbacks in the climate system. As the surface [[temperature]] of the Earth increases there are increased levels of [[evaporation]] from the [[ocean]]s. This increased evaporation results in more clouds forming in the lower [[atmosphere]]. These clouds in turn reflect some incident solar radiation back into space, slightly decreasing the surface temperature, reducing the number of clouds.<ref>Southwest Climate Change Network. (October 10, 2015). ''Negative Feedback Cycle'' [Online]. Available: http://www.southwestclimatechange.org/figures/feedback_cycles</ref>

			==For Further Reading==
			Feedback plays a role in:
			*[[Carbon cycle]]
			*[[Natural carbon cycle]]
			*[[Ocean heat]]
			*[[Ocean acidification]]
			*[[Global warming]]
			*[[glacier#Receding Glaciers\|Glacial retreat]]
			*Or explore a [[Special:Random\|random page]]

	==References==		==References==
	{{reflist}}		{{reflist}}
			[[Category:Uploaded]]

Jmdonev: 1 revision imported

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Jmdonev at 21:50, 22 December 2015

2015-12-22T21:50:55Z

New page

[[Category:Done 2016-01-15]]
<onlyinclude>'''Negative feedback''' is a process that minimizes or reduces some initial effect, generally some disturbance causes some secondary effect that in turn minimizes the magnitude of the initial disturbance. This causes some initial change to grow smaller, keeping the system from moving out of its equilibrium state.</onlyinclude> The flow chart shown in Figure 1 can be used to clarify how exactly these changes occur, how they are connected, and how they result in an overall decrease of some initial effect.

[[File:negativefeedbackloop1.png|400px|center|framed|Figure 1. A flow chart to show the general process of some negative feedback, with an initial "push" to the system causing other effects that keep the system in its original state.<ref name=im>''Created internally by a member of the Energy Education team.''</ref>]]

From Figure 1, the explanation of what a negative feedback is can be simplified. Essentially, it is some initial push being applied to a system, creating some effect A. This effect can then change some properties throughout the system that then produces some later effect B, which may continue to change properties of the system. Eventually, the effect B then reduces the severity of the initial effect A. This pushes a system back into equilibrium after some disturbance. There are numerous examples of negative feedback in mechanics, in the human body, and in nature. Additionally, the concept of [[negative climate feedback]]s are important in understanding [[climate change]].

==Examples of Negative Feedback==
To simplify what this idea of a negative feedback actually means, it sometimes helps to approach the concept in a variety of different contexts. A negative feedback that can be simple to understand is the way that the body cools itself. As internal body temperature rises sweat is produced. The sweat then evaporates, cooling the skin and returning the body temperature to a more manageable level.<ref name="RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>

In mechanical systems, the motion of a spring can be seen as a negative feedback. When a spring is compressed and released, it will return to its initial shape after the [[force]] on it is gone. The tendency of the spring is to move back to its equilibrium position after being compressed.<ref name=ex>Your Dictionary. (November 3, 2015). ''Examples of Negative Feedback'' [Online]. Available: http://examples.yourdictionary.com/examples-of-negative-feedback.html#whSyCiHpM4VDyyxy.99</ref>

As well, when a student receives a test back where incorrect answers have been marked, it is a type of negative feedback. By seeing which questions were done incorrectly, the student determines how to do the problems correctly and the questions will be done correctly on the next test.

[[File:negativefeedbackloop2.png|400px|center|framed|Figure 2. A flow chart showing the one of the most significant negative feedback loops in the climate system - the cloud negative feedback.<ref name=im/>]]

One example of a negative feedback in the climate is the formation of [[cloud]]s - and corresponding reduction in [[solar radiation]] absorption. This cloud feedback is outlined in Figure 2, and is one of the most important negative feedbacks in the climate system. As the surface [[temperature]] of the Earth increases there are increased levels of [[evaporation]] from the [[ocean]]s. This increased evaporation results in more clouds forming in the lower [[atmosphere]]. These clouds in turn reflect some incident solar radiation back into space, slightly decreasing the surface temperature, reducing the number of clouds.<ref>Southwest Climate Change Network. (October 10, 2015). ''Negative Feedback Cycle'' [Online]. Available: http://www.southwestclimatechange.org/figures/feedback_cycles</ref>

==References==
{{reflist}}