Force ñ The two forces acting on a skier are air resistence and gravity. Gravitational force on an inclined plane is directed toward the center of Earth. The perpendicular force to the mountain is the weight of the skier, and the parallel force is the net force of the force of the acceleration of terminal velocity and the skierís mass.
Velocity ñ Velocity of a skier is the direction and the speed of the skier. A racer who can determine his velocity is able to compare the velocity