p5. forces and braking Flashcards
1
Q
what is stopping distance?
A
sum of thinking distance and braking distance
2
Q
what is thinking distance?
A
distance you travel while thinking about stopping
3
Q
what is braking distance?
A
distance you travel while using a force to decelerate / reduce velocity
4
Q
factors affecting thinking distance
A
- alcohol
- tiredness
- drugs + medication
- distractions ( phone )
- speed
5
Q
factors affecting braking distance
A
- condition of road
- weather
- condition of tyre / brakes
- speed
6
Q
how does a car stop? explain in terms of energy transfer and use of forces
A
- kinetic energy transferred to thermal energy
- energy transfer = work done
- work done by brakes through force of friction
7
Q
explain why there are dangers to large decelerations and give examples
A
- greater speed of vehicle = greater braking force
- greater braking force = greater deceleration
eg. brakes overheating / loss of control - shock
- concussion
