This webinar is perfect preparation for final exams. We will look at the key practical skills that you need to be able to describe and measurements that you will have to make. Join Sarah as she considers what to include when writing a practical method, how to analyse data in the form y=mx+c and y=kxn (plotting log-log graphs to find n) and y=Ae-kt (plotting log linear graphs to find k) and methods used to make measurements more accurate (reducing random error, reducing uncertainty, reducing percentage uncertainty). The webinar will examine how to calculate uncertainties in measurements and in derived values. Prior to the webinar you will be provided with extensive notes and all the exam questions we will be working through.


  • Explore how to answer typical data analysis questions for top marks
  • Take away ideas for using your knowledge properly in unexpected contexts
  • Gain knowledge of the key skills examiners are looking for when you answer mathematical questions


  • All students studying AQA A level Physics


Introduction and Welcome

4.05 – 4.30pm

  • Taking measurements – Micrometer screw gauge, Vernier scales
  • Practical methods – ensuring a vertical measurement, reading from scales,
  • Writing a practical method – essential steps to include,
  • Calculating results in tables – appropriate use of sig fig
  • Plotting graphs – suitable scales, plotting points, drawing lines of best fit
  • Student examples – what gets the highest marks and what does not

4.30 – 4.50pm
Calculating gradients and gradients of tangents with units

  • y= mx + c graphs – to find m and c
  • y=kxn (plotting log-log graphs to find n)
  • y=Ae-kt (plotting log linear graphs to find k).

4.50 – 5.00pm
Getting those top marks: key skills and avoiding typical errors

  • Making readings more accurate – reducing random error, reducing uncertainty, reducing percentage uncertainty
  • Calculating uncertainties and percentage difference

Sarah Battams

Sarah is current Senior Examiner for A level and GCSE Physics with a leading examination board. She writes and edits for the online resource GCSE Pod and is an author of high-quality Physics resources on TES. She is an outstanding practitioner with consistently excellent examination results and value added at GCSE and A level. Her uptake at A-level is excellent. She believes that Physics lessons should be motivational and enable students to understand how to tackle examinations. This year she received outstanding feedback from the A-level Practical monitoring visit.