1. Rules and Investigations
Modelling
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2. A model by any other name?
There are real life models…

3. …and there are computer models.
Flight simulator
Car racing game
Science experiment
What if the plane landed too quickly?
What if the driver goes around that bend at 120 mph?
What if the chemical was added at a slower rate?
A model is a representation.
A model imitates the conditions of a real event.
A model allows us to ask What if? And test it!

4. Much cheaper than using the real thing.
Quick results. Simulation can be speeded up.
Can simulate dangerous situations.
The advantages of modelling
Allows for data to be changed to see the consequences.

5. The disadvantage of modelling
Results are usually only approximate and are not exact.

6. Types of modelling software include:
software for engineers to design buildings
software to allow the modelling of sewage pipes and water flow to calculate needs
software to allow military personnel to be prepared for emergencies.

7. Where are you?
A spreadsheet is a computer programme which allows you to create a number of models.
It is made up of columns, rows and cells.
Formulas can be added to make any calculations.
Let’s take a look…..

8. Columns

9. Rows

10. Cells

13. Text labels

14. Numeric data

15. Formulas

17. Rules

18. Variables

19. Making a profit Saving for a digital video camera
Earning money by washing cars

20. A spreadsheet model can be used to work out how much money can be made by washing cars over three months.
Three main figures need to be calculated:
total amount earned … income
total amount spent … expenditure
money left over ... profit.

23. Summary The End A model is a representation of a real thing.
Spreadsheets can be used for modelling.
Spreadsheets are made up of columns, rows and cells.
Data in a cell can be a text label, numeric data or a formula.
A formula is a rule.
A quantity that can change is a variable.
Spreadsheets can be used to test “What if?” questions.
Changing a variable has a consequence.
What can I remember?
The End