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Figure 12 is a speed limit sign from a European motorway - Edexcel - GCSE Physics Combined Science - Question 6 - 2022 - Paper 1
Question 6
Figure 12 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 speed ... show full transcript
Worked Solution & Example Answer:Figure 12 is a speed limit sign from a European motorway - Edexcel - GCSE Physics Combined Science - Question 6 - 2022 - Paper 1
Step 1
Explain why it is safer for drivers to drive at a slower speed in wet weather.
Answer
In wet weather, the road becomes more slippery due to the presence of water. This reduces the friction between the tires and the road surface, making it easier for vehicles to skid or lose control. Consequently, driving at a slower speed gives drivers more time to react and increases the stopping distance, thus reducing the likelihood of accidents. Additionally, slower speeds improve visibility, as reduced speed allows for better observation of surroundings and potential hazards.
Step 2
Show that a speed of 31 m/s is less than a speed of 130 km/h.
Answer
First, convert 31 m/s to km/h:
- Use the conversion factor: 1 m/s = 3.6 km/h.
Thus, we have:
Now compare 111.6 km/h with 130 km/h:
Since 111.6 km/h < 130 km/h, we conclude that a speed of 31 m/s is indeed less than a speed of 130 km/h.