I am working on a mousetrap-powered car for my physics class and ran into a problem. i'm not sure if I am doing this right, but I ran the car from rest and it traveled 7.16 meteres in 4.63 seconds. Using the equation x= V initial(t) + (1/2)at^2, a determined that the car's acceleration is 0.668 m/s^2. Trying to determine the coefficient of friction, I used F-f = m*a. The mass of my car is .100 kg, and I measured the force from the mousetrap to be 10.4 N. As a result of using this equation, i determined that f, the frictional force, is 10.3 N. Using the relationship between the frictional force and the normal force, which is 0.98 N, I determined the coefficient of friction to be 10.5, which seems way too large. I don't know if that all makes sense, but can anyone help Me!?!