Adventures in Natural Frequency Gravity Chimes and Boom Whackers
What can students learn from these? • Natural Frequency • Depends on size and elastic properties of the object • Concept Connections • Frequency, pitch, wavelength
Demos and ExamplesNatural Frequency • Nails • Bells • Tuning Forks • Swing • Pendulum • Musical Instruments • Cephied Variable Stars • Singing Rod • Music Tree • Wine Glass • Organ Pipe • Open and Closed • Frog and Cricket
TREE HOLE FROG ofBORNEOhttp://www.biol.lu.se/zooekologi/epb/people-en/bl-en/bl-meta-en/bl-meta-en.htm
Boom WhackersConstruction • Locate color paper and label each with a note • Obtain a long and short fluorescent lamp guard • Cut each to the lengths provided • in the table B A C G D F E
Gravity ChimesConstruction • Cut aluminum rods to the correct length • Paint each length a different color • Sort the rods according to the order provided • Method 1: Line rods up on the edge of a table and flip them off onto the floor. • Method 2: Hand out the rods to the students in your class and let them drop them in order.