Section 12: Forces Part 3 Flashcards
What is a typical human reaction time?
0.25s
Describe 2 ways of measuring reaction time
Dropping a ruler and catching it, computerised tests involving pressing a button in response to seeing something on the screen - time recorded by the computer
What is stopping distance?
The total distance travelled by a car during the time between the driver seeing the hazard and the car coming to rest
What is thinking distance?
The distance travelled by the car while the driver reacts to the hazard
What is braking distance?
The distance travelled by the car while the brakes do work on the wheels to bring them to a stop
What factors affect thinking distance?
Speed, alcohol, drugs, tiredness, distractions
What factors affect stopping distance?
Speed, condition of the road, weather conditions, condition of tyres, condition of brakes
What are the units of velocity?
m/s
metres per second
What are the units of acceleration?
m/s²
metres per second per second
What are the units of force?
N (newtons)
What are the units of displacement?
m (metres)
(HT) What are the units of momentum?
kg m/s (kilogram-metres per second)
