A student times a trolley as it moves along a track.
Why do light gates give a more accurate time than a stopwatch operated by hand?
Light gates remove the effect of human reaction time
Light gates make the trolley move at a steady speed
Light gates can record more readings in each second
Light gates measure the distance as well as the time
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.