Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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Harmonic Motion
video  - Pendula, Spring and Simple
Pendula, Conical and Torsional
video  - Pendula, Physical (Center of Percussion)
Projected Uniform Circular Motion
Damped Mass on Spring
video  - Forced Oscillations
video  - Resonance Wire Ring
video  - Inverted Pendulum - Function Generator
Inverted Pendulum - Reciprocating Saw
Coupled Pendulum Oscillators
Coupled Magnetic Oscillations
Coupled Harmonic Oscillators
Lissajous Figures on the Scope
Lissajous Fifures with Laser
Parametric Amplifier / Oscillator
Waves
Acoustics
Instruments

video  - Pendula, Spring and Simple

Purpose:

Introduce students to the hanging mass from a spring or a string systems.

SPRING PENDULUM - mass hanging from a spring

One can calculate k for the spring from F = kx by hanging different masses from the end and noting the amount the spring stretches.

Different masses and springs can be used for the pendulum, while noting similarities and/or differences. For example:
• For the same spring k: How does different mass affect the period T?
• For the same mass M: How does different spring affect the period T?

DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 174MB size

DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 37MB size

DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 569MB size

DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 131MB size

SIMPLE PENDULUM - mass hanging from a string

For the simple pendulum, one can measure the length of the string, then calculate the period T. Verify by timing 10 oscillations. Different masses can be used for the pendulum, while noting similarities and/or differences. For example:
• For the same string length L: How does different mass affect the period T?
• For the same mass M: How does different string length affect the period T?
DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 226MB size

DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 49MB size

Hints:

SPRING SIMULATION:

PENDULUM SIMULATION:

Equipment:

• Meter Stick
• Bob on 2 ft. fishing line
• Spring
• Stand
• Support Rod
• Weights