Stopping Distances And Reaction Times Flashcards

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1
Q

what is the stopping distance of a vehicle

A

the distance covered between the driver first spotting the hazard and the car coming to a complete stop

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2
Q

what makes up the stopping distance of a vehicle

A
  • the thinking distance

- and the braking distance

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3
Q

what is the thinking distance

A
  • the distance the car travels in the driver’s reaction time

- time between noticing the hazard and pressing the brakes

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4
Q

what are the two factors that impact thinking distance

A
  • your reaction time (could be increased by tiredness, alcohol, drug or distractions)
  • your speed (the faster you are going, the further you will travel during your reaction time)
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5
Q

what is the braking distance

A

the distance taken to stop the car once the brakes have been applied

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6
Q

what are the four factors that impact braking distance

A
  • your speed (the faster you are going, the longer it takes to stop)
  • the mass of the car (a car full of luggage and people wont stop as quickly as an empty car)
  • the condition of the brakes (worn or faulty brakes wont be able to brake with as much force)
  • friction between tyres and the road (more likely to skid if road is icy, wet or dirty, and the tyres are bald)
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7
Q

what is the minimum depth a tyre must have in order to be safe on the road

A

1.6mm

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8
Q

what is the process of the ruler test

A
  • sit with arm resting on the edge of a table
  • get someone to hold a ruler so it hangs between your thumb and forefinger lined up at 0
  • person holding ruler drops it without any warning
  • close thumb and forefinger to try to catch ruler as quickly as possible
  • measurement on the ruler at the point where it was caught
  • is how far the ruler dropped in the time it took you to react
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9
Q

what are the two ways to measure reaction time

A
  • use a computer based test

- or do the ruler drop test

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10
Q

why should someone place their arm flat on the edge of a table when doing the ruler drop test

A

to prevent them from moving their arm during the test

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11
Q

what does a longer distance regarding where you caught the ruler on the ruler drop test indicate

A

a longer reaction time

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12
Q

why may you need a third person in the ruler drop test

A

to be at eye level with the ruler and check if its lined up

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13
Q

what can you use to calculate the reaction time of the student catching the ruler and why

A
  • the acceleration equation, (v -u) / t

- because the acceleration is constant and equal to gravity, 10m/s^2

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14
Q

what should you do to get a more accurate calculation in the ruler drop test

A
  • repeat the drops many times

- and get an average of the distance the ruler fell

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15
Q

how would you make sure the ruler drop test if a fair test

A
  • keep the variables you arent testing the same every time

- like use the same ruler for every drop and have the same person catching the ruler every time

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16
Q

what is the typical reaction time of an alert driver

A

about 1 second