Book 25, Question 19 · Video
Why are some skyscrapers rounded, tapered, or twisted?
Wind swirling around a tall building can make it wiggle. A shape that changes with height, like a tapering tower or one with a twist, confuses the swirls so that they don't line up and push in rhythm. Rounded corners also make wind flow more smoothly. The Burj Khalifa has a stepped, Y-shaped design for this reason, and it is also pretty to look at.
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What Crafty Clover says in this video
Intro
Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why are some skyscrapers rounded, tapered, or twisted?
The Big Idea
Some skyscrapers are rounded, tapered, or even twisted! They look cool, but there is a science reason too. It is all about wind!
Swirling Wind
Step one: Swirling Wind. Wind swirling around a tall building can make it wiggle. The swirls can push in a steady rhythm.
Changing Shapes
Step two: Changing Shapes. A shape that changes with height, like a tapering tower or one with a twist, confuses the swirls. They do not line up and push in rhythm.
Rounded Corners
Step three: Rounded Corners. Rounded corners also make wind flow more smoothly. The Burj Khalifa has a stepped, Y-shaped design for this reason, and it is pretty too.
A Closer Look
Let's take a closer look! Square towers catch more wind. Rounded corners smooth it. Tapered towers break swirls. Twisted towers confuse wind.
Quick Facts
Quick facts! Wind tunnel tests of small models help designers choose a shape. Burj Khalifa is shaped like a Y. Shapes can be beautiful too. Less wiggle means people inside feel more comfortable.
Think Like a Scientist
Now, think like a scientist! Cut a square and a rounded shape from cardboard. Stand each in front of a fan. Tape a small ribbon behind each one. Which makes the ribbon flutter less? Keep fingers away from the fan.
Outro
Some skyscrapers are rounded, tapered, or twisted because changing shapes confuse wind swirls so they cannot push in rhythm, and rounded corners help wind flow smoothly. Science is amazing! The world is full of surprises. Keep asking big questions, and keep exploring with me! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!