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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) was travelling more slowly. When the car travels at a slower speed, it requires a shorter stopping distance due to reduced kinetic energy, which allows for quicker deceleration. In contrast, having more passengers, worn tyres, or needing new brakes would increase the stopping distance.
Step 2
(ii) Use the graph to find the driver’s reaction time.
Answer
To determine the driver's reaction time, identify the horizontal line on the speed-time graph. The horizontal line indicates the period where the car's speed remains constant before it starts to decelerate. In this case, the horizontal line lasts for 0.6 seconds. Therefore, the driver's reaction time is 0.6 seconds.