Stopping Distances

Question 1

What affects vehicle stopping distance?

Answer 1

→ if brakes work
→ weight/mass of car
→ speed of travel
→ friction of surface
→ driver reachon time (intoxication, mobile phone)
→ external sources of drag
→ slope of road
→ obstacles
→ brake pressure
→ number of passengers
→ condition of tires
→ weather conditions

Question 2

Stopping distance

Answer 2

Thinking Distance + Braking Distance

Question 3

Thinking distance =

Answer 3

Speed x Reaction time

Question 4

Draw a distance-time graph of a guy braking

Answer 4

N/a

Question 5

What affects thinking distance?

Answer 5

Alcohol; other drugs and some medicine; speed; distractions, such as mobile phones; speed; tiredness

Question 6

What affects braking distance?

Answer 6

Weather (rain, ice, snow); speed; condition of tires and brakes; condition of road

Question 7

What affects braking distance?

Answer 7

• velocity
• mass

This as because faster or heavier vehicles have a larger kinetic energy, which needs to be lost in order to brake.

Question 8

Kinetic energy formula

Answer 8

Kinetic energy = 1/2(m)v^2

m = mass
v = velocity