This article focuses on why different objects reach the bottom of a slope at different times. When teaching children the importance of motion and the forces put upon motion, a common model is a toy car on a slope. Typically, gravity is the scapegoat for this phenomenom. As teachers, we must understand that gravity is not the only force weighing on the objects. Friction, mass, and distribution of mass are all decoded in this article. Before teaching students about these forces, it is important to do research about the topic. This article is a good resources for educators to become more acquainted with different forces that need to be taught. It also gives many models for each force described. The educator should bring the information and models to his/her classroom.
Robertson, Bill. “Q: Why don’t all rolling objects reach the bottom of an incline at the same time?” Science and Children (October 2011): n. pag. National Science Teachers Association Journal. Web. 19 Feb. 2017. <http://static.nsta.org/files/sc1102_62.pdf>.