3.6 +3.7 Stopping distances & freefall

Question 1

what is stopping distance?

Answer 1

thinking distance + breaking distance
* thinking= distance car travels while driver is reacting (human part)
* breaking = distance car travels while the driver applies breaks (car part)

Question 2

how are thinking distance and breaking distance calculated?

Answer 2

• thinking distance= speed × reaction time
• breaking distnace : suvat equations

assuming constant acceleration

Question 3

what factors affect thinking diatnce and breaking distance?

Answer 3

thinking: (person)
* tiredness/ energy levels
* alcohol
* drugs
* distraction

Breaking: (car)
* weather
* worn tyres
* faulty brakes
* badly mainited roads

Question 4

what is free fall?

Answer 4

the fall of a body through a medium without a drag producing device

Question 5

What is the acceleration of all bodies during freefall?

Answer 5

g

independant of mass