AQA GCSE Physics · 8463
Specification 4.5.6.3.1, 4.5.6.3.2 · Paper 2
- Revise: Stopping distance
The time between a driver noticing a need to stop and applying the brakes.
- Revise: Reaction time
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GCSE Physics · key term
The time between a stimulus occurring and a person making a response.
Used by AQA, Edexcel and OCR
Specification 4.5.6.3.1, 4.5.6.3.2 · Paper 2
The time between a driver noticing a need to stop and applying the brakes.
Specification 2.27, 2.29, 2.30 · Paper 1
Keep reaction time and thinking distance distinct: reaction time is measured in seconds, whereas thinking distance is measured in metres.
State that reaction time is measured from the appearance of the stimulus to the start of the response.
Use metres for the fall distance when substituting into , and give reaction time in seconds.
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The time between a stimulus occurring and a person beginning their response.
Human reaction time is the interval between the stimulus occurring and the person beginning their response. It includes the time needed to detect the change, process the information and initiate an action.
The time between the driver recognising a hazard and applying the brakes.
The time between a stimulus occurring and the person making a response.
Specification P8.1d · Paper 2 (Foundation), Paper 4 (Higher)
The time between a stimulus occurring and the start of a person's response.
Revise: Reaction timesHuman reaction time is the interval between a stimulus occurring and the start of a response. For example, the stimulus might be a ruler being released and the response might be the fingers closing to catch it. The delay exists because the stimulus must be detected, information must be processed and a response must be produced.
Paper 1, Paper 2
The time between detecting a stimulus or hazard and beginning a response.
Revise: Reaction Time, Stopping Distances and Road SafetyDuring this reaction time, the vehicle continues at approximately its original speed and covers the thinking distance. It then slows while the brakes act, covering the braking distance.