A model is …
a simple system which reveals important
properties of a more complicated system
you wish to understand.
The physical layout of proposed
Green house effect
Is a scientific model used to explain the effect of
increased carbon dioxide levels on the average
temperature of the earth.
It is an example of an analogy
The earth has very few similarities to a green
house and it’s climate is extremely complicated
The most famous formula in
What does it mean?
Energy and mass are
Visual models - atoms
All models have
they are simple.
Neither of these
models is an atom.
Both of these models
There are tons of atom
Identifying sub atomic particles
Predicting the reactions of lithium
Atoms also generate lots of size models
If one atom in an apple was the size of an apple
then the apple would be the size of the earth.
If an atom is the size of the MCG the nucleus
would be the size of cricket ball at the wicket.
“ a testable idea that tells a story about
what happens in nature”
“a description of nature that can predict
things about many similar situations”
“identifies and generalises patterns in
What makes a good
A good model…
Is as simple as possible
Makes accurate predictions
Can be used to explain other
things (eg. gravity)
Why do they change?
Doesn’t work in new or different situations.
Replaced (steady state universe)
Limited (only use the model in particular
GROUP TASK – CREATE and
DESCRIBE YOUR OWN MODEL
It must improve understanding of a
It must be simple to understand
It can be visual, analogous or even
It doesn’t have to be scientific.
Presented as a poster and explained
Is light a wave or a
This is an inane question.
Hint - there two models of em radiation the wave model and the quantum model