Factors Affecting Thinking Distance & Reaction Time (OCR GCSE Physics A (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 generally increases

Rate thinking distance increases with speed

At same rate as speed

Why thinking distance increases linearly with speed

Reaction time constant, but speed changes

Effect of speed on braking distance

Braking distance increases

Why braking distance increases with speed

More KE due to v2v^2 relationship; increases at higher rate than speed

Kinetic energy formula

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

Why KE increase means more braking distance

More work needed to transfer KE (constant braking force)

Work done formula

W=FsW = Fs

Use of stopping distance vs speed graphs

Compare different vehicles' stopping distances

At 35mph: Blue vs Red vehicle stopping distance

Blue: 23m, Red: 29m (Blue shorter)

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