Physics Pearson A-Level Revision
Complete topic breakdowns, revision notes, exam practice questions, and adaptive quizzes for the Pearson A-Level Physics specification.
Specification Topics
Top Exam Tips
- Memorise rules for combining uncertainties.
- Always show working for uncertainty calculations.
- Use significant figures consistently.
- Memorise the rules for combining uncertainties.
- Practise calculating uncertainties from given data.
- Always include units and appropriate precision in final answers.
- Always label axes with both the quantity and its unit, and use a simple, linear scale (e.g., steps of 1, 2, 5, 10) that maximises the graph area.
- When plotting error bars, use a sharp pencil and ensure they are clearly visible; if both horizontal and vertical bars are needed, make them distinguishable (e.g., different dash lengths).
- For gradient calculation, select two widely spaced points on the line of best fit (not data points) and draw a large triangle to minimise percentage uncertainty in the gradient.
- Consider whether the relationship is expected to pass through the origin; if so, discuss possible reasons for a non-zero intercept (systematic error) in your evaluation.
Common Mistakes to Avoid
- Confusing absolute and percentage uncertainties.
- Incorrectly combining uncertainties (e.g., adding when should use quadrature).
- Forgetting to include units in final answers.
- Confusing random and systematic errors.
- Incorrectly combining uncertainties (e.g., adding instead of using quadrature).
- Failing to quote uncertainties to the correct number of significant figures.
- Students often use the plotted data points instead of the line of best fit to calculate gradient or intercept, leading to inaccuracies.
- Drawing error bars that are too short or inconsistent with the stated uncertainties, or omitting them entirely when required.
Key Terminology & Definitions
- Error analysis
- Precision
- Uncertainty
- Graphical representation
- Linearization
- Measurement
- Unit conversion
- Approximation
- Significant figures
- Expanding universe
- Cosmic microwave background
- Gravity
- Orbits
- Kepler's laws
- Orbital mechanics