Damped periodic motions used in the study of the drag coefficient Stelian Alaci, Constantin Filote, Daniel Fodorcan, Erwin-Vasile Alexandru, Dumitru Amarandei and Florina-Carmen Ciornei MATEC Web Conf., 112 (2017) 07003 Published online: 03 July 2017 DOI: 10.1051/matecconf/201711207003