P5- forces, breaking and moment Flashcards
1
Q
What is thinking distance?
A
the distance the car travels from the driver seeing danger and pressing the breaks. (reaction time)
2
Q
what is breaking distance?
A
the distance the car travels from the driver pressing the breaks and the car stopping>
3
Q
what are the effectors of thinking distance?
A
drug & alcohol use, distraction, age, tiredness
4
Q
what are the effectors of breaking distance?
A
conditions of break in car, weather wet + icy, speed prior to breaking
5
Q
how do you calculate stopping distance?
A
thinking distance + breaking distance
6
Q
what is a typical reaction time?
A
0.2-0.9
7
Q
what is the conservation of moment?
A
in a closed system, the total moment before an event and the total moment after an event are the same
8
Q
what are the units of momentum?
A
kgm/s
