Student Misconceptions and the Conservation of Energy

• Autores: Peter Froehle, Charles Miller
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 50, Nº. 6, 2012, pág. 367
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • An interesting, quick, and inexpensive lab that we do with our students is to tape one end of a string just less than halfway around the back side of a uniform solid cylinder m1 and attach the other end of the string to a mass m2 that is below a pulley (Fig. 1). Data can be collected using either an Ultra Pulley (Fig. 2) or a motion detector with a protective cage designed to stop the falling mass (Fig. 3). We found that each measuring device worked equally well. When experimenting, let m2 hang freely and release the cylinder. The mass m2 is allowed to fall a defined distance h. Note that many motion detectors do not measure accurately within 15 cm of the detector.