Modelling with Functions (Edexcel International AS Maths): Revision Note
Exam code: XMA01
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Modelling with functions
What is a mathematical model?
A mathematical model simplifies a real-world situation so it can be described using mathematics which can then be used to make predictions
The path a stone will take if thrown from the top of a cliff
The number of toys a factory can produce in a day
Assumptions about the situation are made in order to simplify the mathematics
Air resistance on the stone can be ignored
The machines/people at the factory produce toys at a constant rate
Models can be refined (improved) if further information is available or the model is compared to real-world data
The mass of the stone needs to be considered
30-minutes downtime per day is allowed for machine repairs/maintenance
How do I use mathematical models?
There will be no one-size-fits-all step-by-step guide to solving modelling questions
A combination of skills and problem-solving skills will be needed
Examiner Tips and Tricks
Reciprocal graphs generally have two parts/curves
Only one – usually the positive – may be relevant to the model
Think about why x/t/θ can only take positive values?
Worked Example
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