Summer STEM Challenge: The Bernoulli Magic Roundabout
STEM Challenge #54: How blowing can suck, Bernoulli Roundabouts and Hoversuckocraft on your ceiling “P + ½ ρ.v 2 is a constant” – Daniel Bernoulli You’ll find this little equation inside things all over the place. And one of the far-from-obvious results is that blowing can suck. You might have seen a little hovercraft created from a balloon and a CD. They’re simple enough to make: you take a CD, stick a stub of a plastic tube on it, on the side with the ridge for the balloon. Inflate a balloon and hold the neck while you attach it to the CD. Let go of the balloon neck, and air will whoosh out from the middle and it’ll hover and glide beautifully across a smooth table. But now try this. Check your ceiling is smooth, then try your little hovercraft upside down on the ceiling. That’s nuts…