Lesson 2: Cavitation (LLoC: REAL PHYSICS + FLUID DYNAMICS)
He wheeled out a transparent tube
filled with water and a spinning propeller.
He switched it on.
The water flashed with tiny white bubbles.
Amy’s eyes widened. “Those tiny bubbles can break metal?”
“Yes! When they collapse, they create shockwaves up to hundreds
of atmospheres. It’s like tiny grenades hitting the blade.”
Ethan leaned forward.
“Can it break a watermelon?”
Dr. Mayhem grinned
like a supervillain.
“I’m so proud of
you.”
He replaced the propeller model with a watermelon suspended
in water—
and turned the machine up.
BWOOMP!
The melon imploded inward like a crushed soda can.
Ray whispered, “That was horrifying.”
Lucy whispered back, “I want to do it again.”
Lesson 3: Resonance Frequency (REAL
STRUCTURAL PHYSICS)
Dr. Mayhem wheeled out a metal
platform with speakers.
“When something
vibrates at its resonance frequency, even small forces become HUGE.”
Amy nodded. “Like the Tacoma Narrows Bridge collapse?”
Dr. Mayhem sparkled with joy.
“YES! A student who actually KNOWS things!”
He placed a watermelon on the vibrating plate.
“As I increase frequency—”
hum humm HUMMM HUUUMMMMM
The melon began to wobble…
wobble…
wobble—
SPLURT!
It burst like a biological water balloon.
Students screamed.
Ethan applauded.
Ray wiped seeds off his forehead.
“That,” Dr. Mayhem said, “is structural resonance.”
LLoC Quotes
“Can it break a watermelon?”...“I’m so proud of you.”
“YES! A student who actually KNOWS things!”
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