stopping distances

• what is stopping distance

  • the distance between seeing an object and stopping
• what is thinking distance

  • the distance covered while seeing the object/drivers react
  • can be effected through tiredness,alcohol or drugs
  • proportional to velocity
• what is breaking distance

  • the distance covered while breaks have been applied and is the ratio of ke of car and breaking force as the work used stop the car is equal to the transferred to other surrondings such as heay
  • can be effected through mainly speed but also road conditions or conditions of the tyres as worn tryes create less friction increasing breaking distance
  • breaking distance is proportional to velocity squared
• what happens under mass decelerations

  • Decelerations is when friction is converted to heat too quickly and can cause whiplash between the driver and the vehicle or the driver to lose control of the vechile
• what is the average speed for walking,running,cycling and driving

  walking - 1.5m/s

  running - 3m/s

  cycling - 6m/s

  driving - 20m/s
• what is reaction time

  • a measure of how much time passed between someone seeing an object and reacting to it
• describe a method for measuring reaction time

  • person a should hold a ruler vertically over the top of persons b hand
  • person a should suddnely drop the ruler leading to person b catching it
  • the ruler is marked at the point where person b caught it which is the distance - the longer distance = longer reaction time
• what is the relationship between stopping distance and speed

  • the faster an object moves the faster the stopping distance