Explain how tiredness, alcohol, drugs and distractions can increase reaction time.

In the subtopic Stopping distances and safety, this learning objective focuses on explain how tiredness, alcohol, drugs and distractions can increase reaction time. For AQA GCSE Physics 8463 Unit 4.5 Forces, keep the explanation inside Stopping distances and safety and Forces and motion. Approved keywords for this objective include reaction time. A strong answer separates scalar and vector quantities, uses correct units where quantities are involved, and links the physical reasoning back to explain how tiredness, alcohol, drugs and distractions can increase reaction time. This is not a generic revision point: it is specifically about Stopping distances and safety, Forces and motion, and the approved wording of the learning objective.