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9 (a) Figure 15 is a speed limit sign from a European motorway - Edexcel - GCSE Physics - Question 9 - 2022 - Paper 1
Question 9
9 (a) Figure 15 is a speed limit sign from a European motorway. The speeds shown are in km/h (kilometres per hour). (i) The sign tells drivers to drive at a slower ... show full transcript
Worked Solution & Example Answer:9 (a) Figure 15 is a speed limit sign from a European motorway - Edexcel - GCSE Physics - Question 9 - 2022 - Paper 1
Step 1
Explain why it is safer for drivers to drive at a slower speed in wet weather.
Answer
When driving in wet conditions, the road surface becomes slippery due to water on the pavement. This reduces the friction between the tires and the road, which can lead to a loss of traction.
As a result, vehicles require a longer stopping distance in wet weather. By driving at a slower speed, drivers have more time to react to obstacles and can stop their vehicles more safely. Slower speeds also help prevent skidding or losing control, thus reducing the likelihood of accidents.
Step 2
Show that a speed of 31 m/s is less than a speed of 130 km/h.
Answer
To compare the two speeds, we can convert them into the same units. First, we convert 31 m/s into km/h:
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We know that 1 m = 0.001 km, so:
Now we compare:
- 31 m/s = 111.6 km/h
- 130 km/h > 111.6 km/h
Thus, 31 m/s is indeed less than 130 km/h.