Ibarreta, R.S., Jecong, J.F.M. and Soriano, M.N. 2002. Measurement of coefficient of kinetic friction using color tracking. Proceedings of the Samahang Pisika ng Pilipinas, 20(1), SPP-2002-PP-42. URL: https://proceedings.spp-online.org/article/view/SPP-2002-PP-42.