6. References

6. References: Website https://en.wikipedia.org/wiki/Friction Britannica, T. Editors of Encyclopaedia (2020, June 24). Coefficient of friction. Encyclopedia Britannica. https://www.britannica.com/science/coefficient-of-friction Book Roberto C. dante. (2016).Handbook of Friction Materials and their Applications. kurtus, R. K. (2002). Determining the coefficient of friction. Succeed in Physical Science, 1(1), 1–9. https://nfsi.org/wp-content/uploads/2013/10/Determining.pdf Journal Article Finio, B. (n.d.). Phone Book Friction. Phone Book Friction. doi:https://www.scientificamerican.com/article/phone-book-friction/