Study of the Damped Pendulum
  Experiments on the oscillatory motion of a suspended bar magnet throws light on the damping effects acting on the pendulum. The viscous drag offered by air was found the be the main contributor for slowing the pendulum down. The nature and magnitude of the damping effects were shown to be strongly dependent on the amplitude. 
Akhil Arora, Rahul Rawat, Sampreet Kaur and P. Arun