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Physics of Music Boxes

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by

Emily Galbraith

on 8 February 2013

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Transcript of Physics of Music Boxes

Emilee's Hypothesis: Emily's Hypothesis The Works Output Emilee's Results Music Boxes The teeth of the comb 'ring', or sound, as they slip off the pins. The comb is a flat piece of metal with dozens or even hundreds of tuned teeth of different lengths. Cylinder is a metallic card which is studded with tiny pins/grooves in the correct spacing to produce music. Windup Key Spring Motor Bedplate The surface where the music box is placed will affect the volume, loud or soft. test control constants:
Music Box
Carpet
Decibel Measurer Different Surfaces:
Door
Laptop
Tissue Box
Desk Music Box on carpet surface The larger the surface area of the object where the music box is placed, the louder the volume. What was Emilee's hypothesis? Was it correct? No Name the 3 main parts of a music box. Cylinder, Spring Motor, and Comb Basically, how does a music box work? Motor turns cylinder. Cylinder's grooves displace the comb teeth. Was it correct? What was Emily's hypothesis? By Emilee Thomas and Emily Galbraith BONUS QUESTION! What is the tune that our music box played? Ballerina:
From Swan Lake The Physics Forced Vibration History: - Music boxes were invented in the 19th/20th century.
They were originally made by watchmakers and they were meant to fit into a man's coat pocket, or a table accessory.
- They were mainly produced in Switzerland and the first factory made for them came up in 1815 by two men named Jérémie Recordon and Samuel Junod. There were also a few manufacturers in Bohemia and Germany. And by the end of the 19th century factories were opened up in the USA.
- They were first made with metal discs instead of cylinders. Test Control Music box on larger pieces of glass. Music box on a 448.5 cm piece of glass. Constants:
Decibel measurer
Music box
Glass Emilee's Testing: Placing music box on different surfaces and measuring the volume Emily's Testing: Placed music box on different sizes of glass from picture frames. Process Carpet 111.7 dB Desk 115.5 dB Tissue Box 102.6 dB Door 106.3 dB Computer 83.1 dB Surfaces (dB) Conclusions Emily My hypothesis was incorrect. I thought that the larger the surface area, the louder the sound. I think this happened because sound must not vibrate glass as well as other surfaces/materials. Emilee My hypothesis was for the most part incorrect. Most of the surfaces I tried were quieter than the carpet. I think all that changed was the quality of the sound, not the loudness. The surface where the music box is placed will affect the volume, loud or soft. The inclination of one object to force another adjoining object into a vibrating motion is referred to as a "forced vibration". A person, or thing, puts energy into an object by having direct contact with it. Cylinder's pins and comb This energy input disturbs the objects particles and forces the object into a vibrating motion - at its natural frequency. Tuning fork on whiteboard 80.9 dB 49.9 dB 80.3 dB 71.2 dB Volume Glass Size Emily's Results Control Control What physics principle did we use in our projects? What is forced vibration? Forced Vibration The inclination of one object to force another connection object to a vibrate. No 2 (dB) (surface area) 76.6 dB 448.5 cm 459.2 cm 997.6 cm 1968.2 cm 1204 cm 2 2 2 2 2 Volume The larger the surface area of the object where the music box is placed, the louder the volume.
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