the police department determined that the force required to drag a 130 N(29 lb) car tire across the pavement at a constant velocity is called 100N (23 lb ) specifications from the trucks manufacturer claim that the effecrive coefficient of kinetic friction between the tires and road for both new car and truck??
The force of friction is given by: f = μR, where μ is the friction coefficient and R is the reaction force, which will be equal to the weight. 100 = μ x 130 μ = 0.77
