Four athletes are preparing to compete in a 200textm200\\text{ m}200textm track race.
Name a suitable measuring instrument that: (i) the ground crew could use to measure the 200textm200\\text{ m}200textm distance before marking the lanes. (ii) a timekeeper could use to record the duration of the run.
Assuming the timing device functions perfectly, explain how a human timekeeper might still introduce an inaccuracy into the recorded time.
The winner finishes the race in a time of 25.0texts25.0\\text{ s}25.0texts. (i) Calculate the average speed of the winner. (ii) Suggest one reason why the average speed of the winner is less than their top speed during the race.
On another day, the starter and the timekeeper use the starting pistol and their initial timing equipment to measure the speed of sound. (i) Suggest a suitable distance that the timekeeper should stand from the starter. (ii) Describe how the timekeeper knows exactly when to start the timer.
164 exam-style questions on CIE IGCSE Physics Physical quantities and measurement techniques, covering Physical quantities and measurement techniques. Each one has a worked solution and a mark scheme showing where the marks go.