#### Revision Notes

##### What connects speed, density & pressure?

Speed, Density and Pressure are all examples of variables which are calculated by dividing one thing by another:

Speed = Distance ÷ Time

Density = Mass ÷ Volume

Pressure = Force ÷ Area

In that respect they can all be treated in the same way.

##### Doing speed, density & pressure questions

1. Use UNITS in Q (or other info) to write down a formula
2. Create BLUE TRIANGLE:

e.g. for Speed, Distance and Time

3. For each part of the Q write down

• what you know
• what you want to know

4. Use Blue Triangle to REARRANGE formula (if necessary)

5. SUBSTITUTE numbers and SOLVE

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### Author: Simon

After 24 years teaching A Level Further Maths, Maths whizz Simon focused his attention on tutoring. He’s helped thousands of young people make sense of Maths and now he’s helping you too – aren’t you lucky! He’s even worked as an Edexcel examiner, so knows exactly what they’re looking for.