1a2 marks
The table shows the stopping distances for a car.
| Speed of car (m/s) |
Thinking distance (m) |
Braking distance (m) |
Stopping distance (m) |
| 4 | 3 | 1.5 | 4.5 |
| 8 | 6 | 6 | 12 |
| 16 | 12 | 24 | 36 |
| 32 | 24 | ................ | ............... |
a)
Add the missing results to the table at a speed of 32 m/s.
[2]
1b2 marks
Higher Tier Only
b)
The car takes 6 m to brake when moving at 8 m/s.
Look at the graph of the car as it starts to brake and then stop.
Look at the graph of the car as it starts to brake and then stop.
Use the graph to show that the braking distance is 6 m.
[2]
1c2 marks
c)
The formula to work out kinetic energy is:
kinetic energy = 0.5 × mass × (velocity2)
A car has 30 000 J of energy and a mass of 1 tonne (1 tonne = 1 000 kg).
Calculate the velocity of the car and show your working.
kinetic energy = 0.5 × mass × (velocity2)
A car has 30 000 J of energy and a mass of 1 tonne (1 tonne = 1 000 kg).
Calculate the velocity of the car and show your working.
Answer = ......................... m/s [2]
1d4 marks
d)
Cars and lorries have different brakes.
- Brakes absorb the energy of the vehicle before it comes to rest.
- The brakes on lorries have larger brake discs and brake pads than cars.
- Brakes are designed to increase airflow.
Explain why increased airflow is more important for lorries than cars.
[4]
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The energy at the bottom of the slope is less than expected.