Tuesday, 17 June 2014 14:03

## G2-25: COUPLED PENDULA - 1000:100:10:1 MASS RATIO.

• ID Code: G2-25
• Purpose: Illustrate a complex resonance system.
• Description: Four pendula are suspended in series from a pole. Each have the same length; the largest is 5000 g and the smallest 5 g. The supporting pole must be securely clamped to the table. Invite students to predict how a movement of the uppermost weight will affect the others.

Tap the heaviest (top) weight gently. Energy couples downward through the pendula, with the amplitude of each successive pendulum becoming greater.

This demonstration is an analog to the system developed by University of Maryland Physics Professor J. P. Richard to increase the amplitude of the vibration from gravitational wave antennas. The mechanical vibration is then converted into an electrical signal using a transducer.

• Availability: Available
• Loc codes: G2, FS1
• #### G2-01 MASS ON SPRING - HAND HELD

Demonstrates resonance and phase shift at resonance Read More
• #### G2-02: FORCED HARMONIC MOTION WITH DAMPING - LARGE

Demonstrate and graph driven and damped harmonic motion. Read More
• #### G2-03: RESONANCE IN TORSIONAL PENDULUM - PROJECTION

Demonstrate quantitatively all aspects of the driven and damped oscillator. Read More
• #### G2-04: DAMPED OSCILLATIONS

Demonstrate damped harmonic oscillations. Read More
• #### G2-05: AIR TRACK - DRIVEN AND DAMPED OSCILLATIONS

Illustrate the behavior of a driven and damped oscillator. Read More
• #### G2-06: FRAHM'S FREQUENCY METER

Check the 60 Hz line voltage frequency. Read More

• #### G2-08: DRIVEN NONLINEAR OSCILLATOR

Demonstrate amplitude "jumps" and resonance hysteresis in Duffing's equation. Read More
• #### G2-09: FORCED HARMONIC MOTION WITH SONAR

Plot a graph of forced damped harmonic motion near the resonant frequency. Read More
• #### G2-11: RESONANT SAW BLADES - HAND DRIVEN

Show that a mechanical oscillator responds with a maximum amplitude to its own resonant frequency. Read More

• #### G2-21 COUPLED PENDULA

Demonstrates coupling of motion between two pendula of the same length Read More
• #### G2-22: BAR-COUPLED PENDULA

Demonstrate a coupling resonance and to show normal modes. Read More
• #### G2-23: SPRING-COUPLED PHYSICAL PENDULA

Demonstrate resonance and normal modes. Read More

• #### G2-25: COUPLED PENDULA - 1000:100:10:1 MASS RATIO.

Illustrate a complex resonance system. Read More
• #### G2-26: COUPLED AIR TRACK GLIDERS

Demonstrate coupled oscillations and normal modes in a system of two identical coupled air track gliders. Read More
• #### G2-27: COUPLED SERIES MASSES HANGING ON SPRINGS

Illustrate coupled oscillations and normal modes. Read More
• #### G2-28: COUPLED PENDULA WITH VARIABLE DRIVER

Show that the maximum coupling occurs between pendula of the same length. Read More
• #### G2-41: WILBERFORCE PENDULUM

Demonstrate a linear coupling resonance and normal modes. Read More
• #### G2-42: ELASTIC PENDULUM

Demonstrate a non-linear coupling resonance and stable fixed points. Read More
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