Two students, Mia and Noah, carry out an experiment to determine the average speed of a runner on a school sports field.
Mia measures out the distance of the run by placing her feet heel-to-toe.
She records:
'Distance = 50 shoe-lengths'
Noah uses his pulse to estimate the time taken for the runner to complete the distance.
He records:
'Time = 12 heartbeats'
Give three ways the students could improve their experimental procedure to obtain a more accurate value for the speed.
53 exam-style questions on Edexcel GCSE Physics 2.2 Speed, velocity and acceleration, covering 2.2.1 Speed and distance–time graphs, 2.2.2 Acceleration and the uniform-acceleration equation, 2.2.3 Velocity–time graphs, and 2.2.4 Measuring speed, typical speeds and free-fall acceleration. Each one has a worked solution and a mark scheme showing where the marks go.