# Hydrodynamic Levitation!

On a stream of water you can levitate light balls of all sizes and even disks and cylinders. The mechanism is not the Bernoulli effect…
Want to make this at home:

My friend Blake from InnoVinci emailed me with a cool idea for a video and footage of levitating balls in water streams. Initially it was tough to explain the physics of what was going on. The standard Bernoulli effect relies on the object being completely immersed in the upward-flowing fluid. But in this case the water seems to form a single stream around the object and it’s deflected away and down from the stream. By Newton’s third law, the force on the water by the ball is equal and opposite to the force of the water back on the ball, pushing it up into the stream. There is a stable equilibrium position because if the ball moves into the stream, it “cuts off” the water going over the ball so it drifts out. If it drifts out too far, then lots of water passes over the ball, pushing it back into the stream.

Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen

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Filmed by Raquel Nuno
Slow motion by Hollywood Special Ops http://hollywoodspecialops.com

# How Do Curveballs Change Direction in Midair?

It’s amazing how professional baseball players can throw very fast curveballs, but do you know how do curveballs change direction in midair? Continue reading

# Physics Equations

Everywhere that physics is discussed it is safe to presume that the language of mathematics is never too far away. If we were to eavesdrop on these conversations, whether they occur in front of a blackboard or seated at a cafe with large enough napkins, we would not be surprised to hear and see the most instantly recognizable part of the language of mathematics: equations.

# Teacher Demo: The Nose vs. the Wrecking Ball

A pendulum is constructed from a 1.0-kg mass suspended from the ceiling, with a length of strong string long enough so that, when pulled about 40o from the vertical, the mass comes to nose level.  Continue reading

# Wrapper Worm – Sick Science! #175

You can have a ton of science fun with a straw. You can make it into a blow gun, using the properties of air, or it can double as a pipette when your lab has run out. But did you know you can perform some awesome hands-on science with the straw’s wrapper, too? It’s true. With the Wrapper Worm, we’ll reveal how to turn an ordinary straw wrapper into a growing worm!