PHYSICS - reaction time and stopping distances

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Last updated 3:01 PM on 4/12/23
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16 Terms

1
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km/h --→ metres/hour
x 1000
2
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km/h --→ m/s
(x1000) /3600
3
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typical speed of car
31m/s
4
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typical speed of walking
1\.4m/s
5
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typical speed of running
3\.3m/s
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typical speed of wind
6m/s
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typical speed of sound
330m/s
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what is an accelerometer?
measures acceleration in terms of g (gravity)
9
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acceleration of gravity?
10m/s2
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how can we measure human reaction times?
ruler drop test
11
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typical human reaction time?
0\.25 secs
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conservation of momentum?
momentum before collision = sum of momentum after collision.
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units of momentum?
kgm/s
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what contributes to the stopping distance of a vehicle?
* braking distance
* thinking distance
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factors that affect thinking distance?
* distractions
* tiredness
* drugs/alcohol
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factors affecting braking distance
* road conditions
* condition of car
* speed of car

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