A student uses a stopwatch to time a ball rolling down a 2.0 m ramp.
The student's three times are different from each other.
Which change would most improve the accuracy of the times?
Repeat the timings and calculate a mean
Use a heavier ball so that it rolls faster
Use light gates connected to a data logger
Use a stopwatch that reads to 0.001 s0.001\ \text{s}0.001 s
43 exam-style questions on OCR GCSE Physics 2.1 Motion, covering 2.1.1 Measuring distance and time, 2.1.2 Measuring speed, 2.1.3 Ratios, units and rates in motion, 2.1.4 Scalars and vectors in motion, 2.1.5 Distance-time and velocity-time graphs, 2.1.6 Area under a velocity-time graph, 2.1.7 Average speed for non-uniform motion, and 2.1.8 Uniform motion and uniform acceleration. Each one has a worked solution and a mark scheme showing where the marks go.