@article{mania_mol_brandão_2002,  title={Sliding Block on a Semicircular Track with Friction},  volume={24},  ISSN={1806-1117},  url={https://doi.org/10.1590/S1806-11172002000300009},  DOI={10.1590/S1806-11172002000300009},  number={3},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Mania, A. J. and Mol, A. W. and Brandão, C. S. S.},  year={2002},  month={Sep},  pages={312–316} }