[Doug G]

I was surprised in how the coefficient of friction changed as the wheel's wear. We started Sunday on a clean school floor and measured a coefficient of 0.095 (static) and 0.085 (dynamic). We figured this would be closed enough for testing purposes and kept our practice bot light to make up for the higher coefficients. After about 10-15 minutes of driving around during the first few days of the week, we remeasured the coefficients, they're up to 0.18 (static). We now have some FRP material and get 0.11 (static) on it with our worn in wheels. What is causing a lot of the wearing in the wheels is any dust and dirt on the floor. I absolutely believe that as the floor and wheels wear in, the traction will get slightly better, but still nothing compared to previous years.