p5. forces and braking

Question 1

what is stopping distance?

Answer 1

sum of thinking distance and braking distance

Question 2

what is thinking distance?

Answer 2

distance you travel while thinking about stopping

Question 3

what is braking distance?

Answer 3

distance you travel while using a force to decelerate / reduce velocity

Question 4

factors affecting thinking distance

Answer 4

• alcohol
• tiredness
• drugs + medication
• distractions ( phone )
• speed

Question 5

factors affecting braking distance

Answer 5

• condition of road
• weather
• condition of tyre / brakes
• speed

Question 6

how does a car stop? explain in terms of energy transfer and use of forces

Answer 6

• kinetic energy transferred to thermal energy
• energy transfer = work done
• work done by brakes through force of friction

Question 7

explain why there are dangers to large decelerations and give examples

Answer 7

• greater speed of vehicle = greater braking force
• greater braking force = greater deceleration
  eg. brakes overheating / loss of control
• shock
• concussion