W + C: Systems

Question 1

What is a system?

Answer 1

A system is a load of interrelated parts working together. They are a series of inputs (addition of matter and/or energy into a system), outputs (matter/energy leaves), stores (energy/mass is stored or transformed - builds up), flows (matter/energy moves in a system) and boundaries (limits to the system).

Question 2

What are the three types of property inn a system?

Answer 2

1. elements (things that make up the system of interest)
2. attributes (perceived characteristics of the elements)
3. relationships (descriptions of how the various elements work together to carry out process).

Question 3

What is an open system?

Answer 3

matter and energy can be transferred across the boundary into surrounding environments. Receive inputs/transfer outputs to other systems. Most ecosystems are a good example of this.

Question 4

What is a closed system?

Answer 4

• energy can enter and leave (be and input or an output), but matter can’t enter or leave ( can only cycle between stores)

Question 5

What are isolated systems?

Answer 5

have no interactions with anything outside the boundary. No input or output of energy or
matter.

Question 6

What is dynamic equilibrium?

Answer 6

when there is a balance between the inputs and outputs, despite changing conditions

Question 7

What is a positive feedback loop?

Answer 7

when a change of events amplifies the impacts of the original event - knock on effects. One
example an increase in Carbon Dioxide.

Question 8

What is a negative feedback loop?

Answer 8

a chain of events that nullifies the impacts of the original event - effects of an action are nullified by its subsequent knock-on effects.