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Question
When strong/high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.
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Solution
As we know that, increased wind speed is, indeed, accompanied by a reduced air pressure. (0.5 Marks)
When high speed wind blows over the umbrella it creates a low pressure region because particles have high speed (moves fast) which is why they exerts less force over the umbrella, i.e., less pressure. ( 1 Mark)
Now, the pressure below the umbrella is much more than the pressure above it and hence it upturns the umbrella. (0.5 Marks)
As we know that, increased wind speed is, indeed, accompanied by a reduced air pressure. (0.5 Marks)
When high speed wind blows over the umbrella it creates a low pressure region because particles have high speed (moves fast) which is why they exerts less force over the umbrella, i.e., less pressure. ( 1 Mark)
Now, the pressure below the umbrella is much more than the pressure above it and hence it upturns the umbrella. (0.5 Marks)
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