Your car is skidding to a stop from a high speed. you may want to review ( pages 112 - 114) . part a identify all forces acting on the object.

There are four (4) that can be identify in all forces that acting on the object. Normal force, \vec{n} is a component that is perpendicular to the surface of contact. Air resistance, \vec{D} is a type of friction and it is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. Kinetic friction force, \vec{f}_k is μk times the normal force on an object and it is expressed in units of Newtons. Weight, \vec{w} is a force caused by gravity and it is measured in Newtons.