The physics behind the sudden, sharp crack of a whip
In short: When a whip cracks, it isn't just a loud noise; it is a miniature sonic boom. This video explores how energy conservation allows a whip's tip to break the sound barrier.
Marty Jopson explains that the phenomenon relies on the conservation of energy. As the whip uncoils, its mass decreases while its velocity increases. This transfer of energy allows the tip to reach speeds exceeding 400 m/s, surpassing the speed of sound, which is 353 m/s.
While the handle moves at approximately 10 m/s, the rapid acceleration of the decreasing mass at the end creates a small sonic boom, producing the characteristic sound.
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Sources
- Summary by Intellect · source: Why is Cracking a Whip So Loud?
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