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Problem 12 Wet towels

This exploration delves into the intriguing phenomenon of the loud cracking sound produced when a wet towel is flicked. By investigating the underlying principles—such as frequency, energy levels, and water content—this study seeks to understand why a wet towel exhibits a louder sound compared to a dry one. Key parameters, including whipping technique, towel weight, and moisture levels, will be examined through controlled experimentation. This analysis promises to reveal the acoustic dynamics that create this captivating auditory experience.

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Problem 12 Wet towels

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  1. Problem 12 Wet towels

  2. Overview • 1. • 2. • 3.

  3. Pros • 1. • 2. • 3. • 4. • 5.

  4. Cons • 1. • 2. • 3. • 4.

  5. Problem • When a wet towel is flicked, it may create a cracking sound like a whip. Investigate the effect. Why does a wet towel crack louder than a dry one?

  6. Direction of discussion • 1.Definition • 2.Experiment • 3.Parameters • 4.Sound

  7. Question on definitions • 1.How do you define the “cracking ” sound • 2.How do you distinguish the “cracking” sound from other sound? From frequency or from energy?

  8. Question on experiment

  9. Question on experiment • 1.Is your frame rate fast enough to capture the fastest moment ?Then how long would the moment last? • 2.How do you control the distance between the towels and recorder? • 3.If you put a ruler and capture it from a distance, would there be some deformation?

  10. Questions on parameters • 1.How do you control the force when whipping towels with different weight? • 2.Do you take the weight difference before and after whipped into consideration? • 3. Is there some water be whipped out from the towel ?Will it affect the result? • 4.In which circumstances will you stop adding water to the towel?

  11. Questions on parameters • 5.Is there any different at the end of the towel after whipped? How do you control this part • 6.Will the way of whipping a towel affect the sound? • 7.Will air resistance affect the towel greatly? • 8.A wet towel or a dry towel have greater rate of energy transformation than a dry towel? Why?

  12. Sound • 1.What is the origin of the ”Cracking” sound ? • 2.Which parameter do you think contribute the most to the lager cracking sound of wet towel? • 3.Do you think the shape of the towel end will affect the sound?

  13. Questions for Data • 1.How many times do you whip a towel for one data point? • 2.Is your experiment repeatable?

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