| In the Highway Code, what is the Stopping Distance for a Car that is Traveling at:
1. 30 mph
2. 50 mph
3. 70 mph | 1. 23 Meters is the Stopping Distance, and its Split with:
-9 Meters for the Thinking Distance, 14 for the Breaking Distance
2. 53 Meters is the Stopping Distance, and its Split with:
-15m for the Thinking Distance, 38 for the Breaking Distance
3. 96 Meters is the Stopping Distance, and its Split with:
-21m for the Thinking Distance, 75 for the Breaking Distance. |
| Why is Speed Limits that Important? | -This is because Speed is the Only Factor affects both Thinking and Breaking Distance, and caused for more Devastating Injuries. [The Other Factors are also Important, but they either affect the Thinking or Breaking Distance]
-Also, in the Breaking Distance, if Speed Doubles, then the Breaking Distance will Quadruple. [Squared Relationship] |
| Explain, using Energy Stores and Work Done, what needs to Happen to the Car for it to Stop? | -Brakes on the Car will do Work on the Wheels of said Car. This will then Transfer Energy from the Kinetic Energy Store of the Car, to the Thermal Energy Store of the Brake.
-If the Car needs to Stop, then the Brakes have to Transfer ALL the Energy so:
-Energy in the Cars Kinetic Energy Store = Work Done by the Brakes
1/2 x m x v² = F x d. where M = Mass of car, v² = Speed of Car, F = Braking Force and d = Breaking Distance. |
| How much [Prediction] does a
-Car
-Single Decker Bus
-Loaded Lorry
Weigh? | -Car weighs around 1,000 kg
-Bus weighs around 10,000 kg
-Loaded Lorry weighs around 30,000 kg
Simple |
| How can the Thinking and Breaking Distance be seen on Velocity / Time Graphs? What else can be seen? | -If the Line is Constant, then its the Thinking Distance.
-If the Line is going Slower [Downwards] then its the Breaking Distance
-The Area under the Lines is the Distance [As Distance = Speed x Time]
-The Gradient will always Stay the Same [For that same Vehicle] even when Faster as the Maximum Force will not Change. However, it will Increase the Distance. |
