10 - 20 min

This demonstration uses a slinky and tuning fork to explain two types of waveforms in our world: transverse and longitudinal. A discussion on sound waves is included and leads to categorizing sound waves as longitudinal waves.

Build a device that releases ring shaped air vortices that are visualized using smoke to show the wonders of fluids

Falling space rocks collide with the surface of planets and moons to create impact craters which can be found all over our solar system

Movement of massive objects in space create gravitational waves that travel outward in spacetime and bend light along the way. We detect these waves by using lasers and watching changes in how light moves through space. This demo uses clear jello and a laser to show how collisions create ripples that radiate outward from the source, which are able to bend light.

Make a flaming tube to explore the physics of waves and acoustics.

The Rubens' Tube should be used with caution and vigilance, especially if used indoors. 

 

Recreate E.F.F. Chladni's classic demo of sprinkling sand on a plate and playing it with a violin bow to create and visualize various vibrational patterns. This versatile demo can be adapted to talk about sound wave acoustics, vibrational normal modes, and energy transport to a wide range of audiences. 

Build a simple Chladni plate using a 6" x 6" metal sheet, a 2 watt speaker, powered with a 20 gain amplifier and phone. Sprinkle sand on the sheet, and play various sound frequencies to reveal the sheet's assortment of resonant vibrational modes. 

Along with the plate demo itself, an amplifier can be made fairly easily with an LM386 op amp. Download instructions for making the amplifier under associated files or can be found here

Explore the properties of liquid nitrogen while making a tasty treat. This demo is great for chapter socials and smaller outreach events.

Constructing this simple and inexpensive portable cellphone charger provides an introduction to soldering and electronics.

Practically, these units can be used for charging in regions of the world where grid electricity is not readily available.

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