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TRANSCRIPT
Systems and Feedback Loops
The Big PictureThe study of Earth has been divided in to tiny pieces.
Makes it easier to
better understand each piece!
It’s important to remember that we have to not just understand how the parts work but also how they
interact and connect.
Defining a SystemTo simplify our studies of such a complex place such as Earth, scientists use the concept of a system.
By defining a system, we get a sense of how the system works internally and how it interacts with its surroundings.
System
A system is a portion of the universe that can be separated for the purpose of observing changes that happen in it.
Types of SystemsScientists categorized systems as Open or Closed based whether or not matter or energy can enter or leave the system.
Energy Open!Matter Open!
Energy Closed!Matter Closed!
Energy Open!Matter Closed!
Why is this important in ENV?The balance of energy in an open system is important when predicting global warming and its associated climate change.
Things to remember when dealing with a closed matter system:
There is a finite amount of resources.Our system provides us with our resources and accepts our wastes.All parts of the systems are connected.
System AnalysisWhen you analyze a system, you must know its
inputs and outputs.
• Open up the System 1 Jamboard and navigate to your group’s board.
• On your group’s first Jamboard, draw/insert a picture of the identified system.
• Then identify all the inputs and outputs of the systems.
Let’s Give It A Try!
What are the inputs and outputs?
Inputs OutputsWater
SunlightNutrients
CO2
OxygenSugarWater
Inputs OutputsWaterFood
OxygenSunlight
ManureMethane
WaterCO2
What are the inputs and outputs?
Steady StateWhen you conduct a system analysis, one of the goals is to determine whether or not you are in a steady state situation.
Rate of Inputs = Rate of Outputs
Monitoring the inputs and outputs of a system can indicate if there is a deviation from steady state.
Example is our growing concern that water balance in the ocean and atmosphere will be affected by global climate change.
Feedback SystemsWhen the output acts as an input to the system, you have what is known as a feedback loop.
Negative Feedback - System changes to minimize change and bring things back to steady state.
Positive Feedback - System changes to enhance the change.
Positive Amplifies Negative Resists
Which Is It?
Negative Feedback Positive Feedback
Now It’s Your Turn!Go to Activity 5 in Canvas!
Open the Feedback Loop Poster Presentation
Organize the steps to create a feedback loop!