초록

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Abstract ▼ AI-Helper

To determine know the mechanical characteristics of a damped oscillating simple pendulum in several liquids, we performed experiments to measure the variations of the period and the amplitude. The oscillation period of a simple pendulum was measured repeatedly by changing the bobs with a pendulum ha...

To determine know the mechanical characteristics of a damped oscillating simple pendulum in several liquids, we performed experiments to measure the variations of the period and the amplitude. The oscillation period of a simple pendulum was measured repeatedly by changing the bobs with a pendulum hanging between a He-Ne laser and on optical detector, and an oscilloscope displayed the variation of the light intensity. Also, the added mass constants of different bobs were calculated by comparing the oscillation periods in air and in liquids. Larger added mass meant higher energy loss of the pendulum caused by the resistance of the liquid during the oscillation, and the amount of amplitude reduction was in the order of plastic sphere, small metal sphere, and large metal sphere. The fact that the added mass in water with a larger density is larger than that in methanol was proven experimentally. The Q-factor and the damping constant were calculated using the variation in the amplitude of the pendulum in a liquid, as measured by using an ultrasonic sensor. The result showed that when amplitude reduction was smaller, the energy loss in one period was lower, thus, the Q-factor increased and the damping constant decreased.

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