3.6 +3.7 Stopping distances & freefall Flashcards
1
Q
what is stopping distance?
A
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)
2
Q
how are thinking distance and breaking distance calculated?
A
- thinking distance= speed × reaction time
- breaking distnace : suvat equations
assuming constant acceleration
3
Q
what factors affect thinking diatnce and breaking distance?
A
thinking: (person)
* tiredness/ energy levels
* alcohol
* drugs
* distraction
Breaking: (car)
* weather
* worn tyres
* faulty brakes
* badly mainited roads
4
Q
what is free fall?
A
the fall of a body through a medium without a drag producing device
5
Q
What is the acceleration of all bodies during freefall?
A
g
independant of mass