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A car is travelling at 10 m/s - Edexcel - GCSE Physics Combined Science - Question 3 - 2021 - Paper 1
Question 3
A car is travelling at 10 m/s. The driver sees a danger and stops the car. (i) The stopping distance for the car would be smaller if the car A had more passengers... show full transcript
Worked Solution & Example Answer:A car is travelling at 10 m/s - Edexcel - GCSE Physics Combined Science - Question 3 - 2021 - Paper 1
Step 1
(i) The stopping distance for the car would be smaller if the car
Answer
The correct answer is D: travelling more slowly.
This is because a vehicle traveling at a lower speed will have a shorter stopping distance due to reduced kinetic energy and less momentum. Increased speed increases the stopping distance due to the greater force required to stop the vehicle.
Step 2
(ii) Use the graph to find the driver’s reaction time.
Answer
To determine the driver’s reaction time from the speed-time graph:
- Identify the horizontal section of the graph, where the speed is constant before it begins to decrease. This indicates the reaction time before the brakes are applied.
- Measure the length of this horizontal line along the time axis. In this case, it measures 0.6 seconds.
Thus, the driver’s reaction time is 0.6 seconds.