[★★★]

Simultaneous shadow projection of circular motion and bouncing weight on spring.

Video of the demo in action https://youtu.be/ZlleypTKfGY

What It Shows

One of the simplest of periodic motions is uniform circular motion. By shadow projecting both uniform...

Oscillation of mass on wire in torsional mode of oscillation.

What It Shows

The frequency of oscillation of a torsional pendulum is proportional to the square root of the torsional constant and inversely proportional to the square root of the rotational...

Single air track glider, with and without variable frequency driver, variable damping, and oscilloscope position vs. time display.

What It Shows

With one end of the car attached via a spring to the end of the track and the other end of the car coupled (via...

Coupled, double, physical pendulum executes chaotic motion when non-linear initial conditions are imposed.

What it Shows

A double pendulum executes simple harmonic motion (two normal modes) when displacements from equilibrium are small. However, when...

What it shows:

A large square metal plate, supported and harmonically driven at its center, is made to vibrate in any one of its numerous normal modes of vibration. As with the regular Chladni Plates, the two-dimensional standing wave patterns are made...

A physical pendulum finds stability in its inverted position when driven at the proper frequency and amplitude combination.

How it works

The physical pendulum is a 45 cm x 2 cm x 6 mm (1/4") strip mounted on a ball-bearing pivot and can rotate 360 degrees...

Longitudinal wave demo with suspended slinky.

What it shows:

Demonstration of longitudinal traveling waves in a spring. 

How it works:

The Slinky hangs with a bifilar suspension from a rigid thin-walled electrical conduit frame, which is light, strong and...

Obtain as many harmonics as your arm can handle.

What it shows:

Generation of a standing wave by reflection from a fixed end.

How it works:

A two person demonstration using a 2m (2cm diameter) steel spring. ¹ One party acts as the fixed end, standing...

A 1.5m length of string driven at one end and fixed at the other shows standing waves for various driving frequencies.

What it shows

The fundamental is the most dramatically visible state (usually around 15Hz). It's possible to show up to 8 nodes clearly-...

An aluminum rod, supported in the middle, rings for a long time in its longitudinal mode.

What it shows:

Longitudinal standing waves in solids.

How it works:

A metal rod is not unlike an organ pipe with both ends open. Holding it exactly in the middle will...