3 Oscillations & Waves

Adjustable tuning fork - Video

demonstration image
Catalog: 
3D46.22
Location: 
3_1
Video Encyclopedia :Adjust masses on each tine of a large fork and show the waveform on an oscilloscope. Mistuned forks damp quickly.

Driven Torsion Pendulum, with variable damping

A table showing different resonance values.
Catalog: 
3A60.40
Location: 
Ba3
Driven mass on spring & power supply. A motor provides the forcing function that drives a torsion wheel. The labels are in German with Ein and Aus for on and off on the power supply and Fein and Grob for fine and coarse below the tuning knobs.

Hoops and arcs - Video

demonstration image
Catalog: 
3A15.40
Location: 
3_1
Video Encyclopedia :A hoop oscillates with the same period as arcs corresponding to parts of the hoop.

Two Speaker Interference - Video

Catalog: 
3B55.10C
Location: 
3_1
CCinema Classics: Interference: Sound Transmission. A microphone moves in front of two speakers revealing an interference pattern with an oscilloscope. Using estimates of the pattern geometry, the interference formula and the wave equation, students can calculate the approximate frequency of the sound.

Pulse on a rope - Video

demonstration image
Catalog: 
3B10.10
Location: 
3_1
Video Encyclopedia :A long rope is attached to a wall.

Resonance tubes(3 lengths) - Video

demonstration image
Catalog: 
3D30.10
Location: 
3_1
Video Encyclopedia :Blow air out of a flat nozzle across a set of three different length tubes.

Tacoma Narrows - Video

demonstration image
Catalog: 
3A60.10
Location: 
3_1
Spectacular destruction of a bridge driven at it's natural frequency by the wind.

Resonance Reeds

2nd reed
Catalog: 
3A60.50C
Location: 
Ba3
A set of steel reeds mounted on a common strip which is excited by a variable speed motor with an unbalanced flywheel.

Sweet spot(center of percussion) - Video

demonstration image
Catalog: 
3A15.50C
Location: 
3_1
Video Encyclopedia :Hang a long metal bar by a string from one end. Strike the bar with a mallet at various points.

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