Question 8 of 11beginner🔧 ApplyShort Answer2 marks

Explain why holes are made in banners and hoardings.

Correct Answer

Holes are made in banners and hoardings to allow air to pass through them, reducing the pressure difference between the two sides.

When strong winds blow, a banner without holes would experience high pressure on the windward side and low pressure on the leeward side.

This pressure difference creates a force that can tear or blow away the banner.

The holes allow air to flow through, equalizing the pressure on both sides and reducing the force exerted on the banner, preventing damage during windy conditions.

Exercise: Keep the curiosity alive | Q: 13 | (Page Page 17)
For More Understanding

Explanation

This question applies the concept from Section 6.4 that high-speed winds create low-pressure areas. The chapter explains how pressure differences can cause roofs to blow off. Similarly, banners without holes would experience dangerous pressure differences during strong winds.

Solution Steps

  1. Holes allow air to pass through banners and hoardings, reducing pressure difference between the two sides

  2. Strong winds create high pressure on the windward side and low pressure on the leeward side of a banner without holes

  3. This pressure difference creates a force that can tear or blow away the banner

  4. Holes equalize pressure on both sides, reducing the force and preventing damage

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