Concept clarification
A repeatable method for A-Level Physics problem-solving
A step-by-step approach to unfamiliar physics questions that avoids formula-hunting.
A-Level, Cambridge, EdexcelPhysics5 min read
When a question looks unfamiliar, the temptation is to scan for a formula that fits. A short routine works better.
Six steps
- Draw a diagram and label every quantity given.
- Name the physical principle involved, for example conservation of energy or Newton's second law.
- Write that principle in words, then as an equation.
- Rearrange algebraically before substituting numbers.
- Check units at every stage.
- Ask whether the answer is a sensible size.
Why algebra first?
Rearranging before substituting reduces rounding errors and lets you check units. It also makes your working easy for an examiner to follow.
When you get stuck
Go back to the principle. Most stuck moments come from not being sure which principle applies, not from the mathematics.