stopping and braking

Question 1

what does the stopping vehicle depend on

Answer 1

-thinking distance - directly prop to speed
-braking distance

Question 2

what is stopping distance

Answer 2

the sum of the thinking distance and braking distance
the greater the speed of the vehicle, the longer the stopping distance

Question 3

what is the typical reaction time ,what is the reaction time affected by and how to u measure reaction time

Answer 3

reaction time is 0.2 - 0.9s
and affected by tiredness, drugs ,alcohol and distractions
reaction time measured using lights and sounds as a start signal and a timer to measure how long it takes to react

Question 4

what is the braking distance affected by

Answer 4

-condition of the road
-vehicle
-weather

Question 5

how do you stop a vehicle

Answer 5

applying force to the wheels, greater the force = greater deceleration
when a vehicle is travelling faster, it needs a larger braking force

Question 6

what does the transfer of kinetic energy do

Answer 6

work done transfers kinetic energy of the vehicle into heat energy, increasing temperature pf brakes
if brakes are too larger they will overheat or trye loose traction

Question 7

what is the equation for work done

Answer 7

force x distance (braking distance)

Question 8

for a given braking distance what is required

Answer 8

• doubling mass doubles force required
  -doubling speed quadruplets force required