1.1.5 Explain the nature of equilibrium. What is equilibrium? the average condition of a system in balance over a specific period of time Your syllabus.

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Presentation transcript:

1.1.5 Explain the nature of equilibrium

What is equilibrium? the average condition of a system in balance over a specific period of time Your syllabus identifies two types: –Steady-state equilibrium –Static equilibrium (yawn!)

Graphing Equilibrium Steady Systems: changes over time Many natural open systems inputs = outputs (balance) Negative feedback Static Systems: No change over time Mostly NON-living systems No input or output No feedback

1.1.6 Define and explain the principles of positive feedback and negative feedback.

Feedback Feedback Negative return the system towards the norm self-regulating Leads to a steady-state equilibrium it counteracts deviation from the norm input = output decreases, reduces or dampens the amount of change Positive Pushes the system away from the norm Unregulated Unsteady, unstable, out of balance accelerates deviation from the norm output increases output increases the amount of change (exacerbates the problem)

Recap: system state and feedback

What type of feedback is this?