An examiner is testing a trainee driver's reaction time under emergency braking conditions. The examiner uses a simulator where a bright red indicator light on the dashboard illuminates, and the trainee must press the brake pedal as quickly as possible.
State one reason why the indicator light must be programmed to illuminate at random, unpredictable intervals rather than at fixed, regular intervals.
39 exam-style questions on Edexcel GCSE Physics 2.5 Stopping and braking distances. Each one has a worked solution and a mark scheme showing where the marks go.