Pre-service teachers’ conceptual understanding of rolling friction coefficient

Students do not easily understand the concept of rolling friction. There are factors that influence the rolling friction such as condition of surface, kinds of material, and rolling friction coefficient. In rolling friction, there is no relative motion at the points of contact in a direction parallel to the surface. So, the rolling friction coefficient is usually very small. This research aim was to describe students’ conceptual understanding of rolling friction coefficient on rolling object in the horizontal plane and incline. This research used survey method by using descriptive qualitative. The subjects are 24 students of 4th-semester Physics Education at Universitas Sebelas Maret. The data collected from two-tier diagnostic test and interview. The result are 45.8% students can explain the factor that influences of rolling friction coefficient on rolling object in the incline, 37.5% students can understand the friction force on two different objects when rolling in the incline and only 20.8% of the stu...