Factors Affecting Thinking Distance & Reaction Time (OCR GCSE Physics A, Combined (Gateway Science Suite)): Flashcards

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Factors Affecting Thinking Distance & Reaction Time
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Effect of higher speed on stopping distance

Stopping distance increases

How does thinking distance increase compared to speed?

At the same rate

Why thinking distance increases with speed

Constant reaction time but more distance covered at higher speed

Why does braking distance increase with speed?

More kinetic energy at higher speeds (increases at a higher rate)

Kinetic energy formula

KE=12mv2KE = \frac{1}{2}mv^2

How KE increases as speed increases

At a higher rate

Why more braking distance needed at higher speeds

More work needed to transfer more KE (constant braking force)

Work formula (force and distance)

W=FsW = Fs

Blue vehicle stopping distance at 35mph

23m

Red vehicle stopping distance at 35mph

29m

Vehicle with shorter stopping distance at 35mph

Blue vehicle

What factor stays constant as speed increases (for thinking distance)?

Reaction time

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