Physics – Physics Education
Scientific paper
2006-07-06
Am. J. Phys. 75, 583-587 (2007)
Physics
Physics Education
11 pages, 5 figures
Scientific paper
We analyze a simple problem in elasticity: the \emph{initial} motion of an elastic bar that after being hanged from an end is suddenly released. In a second problem a point mass is attached on the top of the bar. The analytical solutions uncover some unexpected properties, which can be checked, with a digital camera or camcorder, in an alternative setup in which a spring is substituted for the bar. The theoretical model and the experiments are useful to understand the similarities and differences between the elastic properties of bar and spring. Students can take advantage of the home experiments to improve their understanding of elastic waves.
Aguirregabiria Juan M.
Hernandez Adolfo
Rivas Mario
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