Damped Pendulum Oscillations

Description of the Experiment

The purpose of this experiment is to determine the friction constant in a oscillating round motion.

Experimental Apparatus

The pendulum is launched, and the user can choose the length of the rod and the initial angle. The pendulum's rod is attached to the head of a salvaged hard-drive. This allows a measuring of the pendulum's angular velocity, as a function of time.

Protocol

Figura 1: Dados obtidos no laboratório, sem qualquer resistência activa, com o máximo de amostras, bem como o máximo da frequência de amostragem.

Figura 2: Ajuste dos primeiros três periodos à lei da sinusoide com decaímento. A constante de atrito é, neste caso, 0.0122 s-1.

Under construction.

Advanced Protocol

The oscillation period decreases, even though the first three do not show this. Why? Find the mathematical expression that explains this behavior and fit it to the experimental data. Change the friction parameter and find the new friction constant.