How do I calculate coefficant of friction?

Question

In the simulation we are given the distance travled by an object from point A to point B, and the speed of the car released from a hill.

We are then asked to calculate for the coefficant of friction between point A and point B of the cars travel.

Answer 1

Is the car travelling on a flat road without power after being released from the hill and comes to rest at point B?

If that is the case, then probably the easiest way to do this is to equate the work done on the car to the change in kinetic energy.

F_friction * AB = 1/2mv_i^2 =>

mg*mu = (mv^2)/(2AB) =>

mu = v^2/(2*g*AB)

If point A is at the top of the hill and the car begins at rest, you can use the energy dissipated by friction to figure out F_f in the same manner:

1/2mv^2 = mgh - F_f*(length of hill)

solve in the same manner.