A car skids to a stop on an icy road. The car has an initial velocity of 25.0 m/s and skids for 10.4 s before stopping. The mass of the car is unknown. Calculate the acceleration of the car. Draw the free-body diagram with the forces, but without their magnitudes. Find the coefficient of kinetic friction, ?k , between tires and the road. (Tricky. You don’t know the car’s mass, but you don’t have to know it. The mass cancels from the equation.)

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: