A Simple Moment of Inertia Measurement

• Peter F. Hinrichsen ^[1]
  1. [1] John Abbott College

     John Abbott College

     Canadá

     
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 60, Nº. 4, 2022, págs. 292-295
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Modern MEMs gyros/accelerometers allow the angular velocity of pendula to be precisely measured and the angular acceleration to be calculated. For a compound pendulum, ?p?¨=−???sin?, where a is the distance of the center of mass from the pivot, so the moment of inertia Ip of the compound pendulum about the pivot can be simply derived as ?p=−???/?¨(?=?/2) from measurements of the angular acceleration ?¨(?=?/2) when the pendulum is horizontal. Then mga can be determined by measuring the force and lever arm required to maintain the pendulum in a horizontal position.