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Information about ChapB1.1

Published on October 18, 2007

Author: stviator4b



Characteristics of Systems

Characteristics of Systems System Parts system: a group of parts that work together as a unit - a system has cycles and processes that interact, or affect each other

• house, plants, people, animals, hose, sprinkler, and water in a yard • part of system • plants, people, animals living parts • house, hose, sprinkler, and water nonliving parts • edges of yard system are easy to see • edges of natural system aren’t easy to see • scientists must decide what they are studying to figure out edges • studying 1 tree, edge is right around that tree • studying a whole forest, edge is the edge of the forest

Interactions • all parts of systems interact with each other – water cycle • faucet to let water to the hose • hose carries water to sprinkler • sprinkler sprays water on grass • grass uses water to grow • you walk on grass

• yard system is an open system – takes things from outside the system • inputs: things from outside the system – sunshine, water – rain – also let things out of system • outputs: things that leave a system – water: runs out of lawn to sidewalk/street or evaporates into air • closed system: no inputs or outputs – very few systems are closed

Stability and Change • all systems follow patterns of change – in a yard periods of sunshine and shade each day = pattern – cycle of wet and dry = pattern • patterns show stability – stability: over time changes in a system cancel each other out • if something is added (ex. sunshine), it is later taken out (ex. sunshine replaced by shade) • system is in balance

• all systems have stability – yard system • sun shines in part of yard each am • in pm that part is shady • grass dries out after no rain • then gets water from sprinkler

Summary • system made of parts that interact – open systems take in inputs and give off outputs – patterns/cycles show stability • system has stability when changes cancel each other out

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