Reaction Time (AQA GCSE Physics): Flashcards

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Reaction Time
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Factors influencing thinking distance

Vehicle speed and reaction time

Typical human reaction time range

0.2 to 0.9 seconds

Factors affecting reaction time

Tiredness, drugs, alcohol, distractions

Why stopwatches ineffective for reaction time

Reaction times are less than a second

Simple method to measure reaction time

Drop ruler, measure distance fallen before caught

Starting hand position for ruler drop test

At 0 cm mark, thumb and forefinger hovering

What longer distance fallen means

Slower reaction time

Acceleration due to gravity value

9.819.81 m/s2^2

Formula to calculate actual reaction time

v2=u2+2asv^2 = u^2 + 2as

Improving accuracy of reaction time test

Repeat test several times and calculate average

Effect of vehicle speed on thinking distance

Faster vehicle = greater distance while reacting

Examples of distractions affecting reaction time

Using a phone, listening to radio

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