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forces 1
         

                         When a skateboarder rolls down the street they have forces acting in the X and Y direction. The forces that I will focus on are only in the Y direction. As a skater rides down the street there are three forces acting on the skateboard. The red arrows in the image indicate the force of  gravity on the mass of the skater(Mg). The black arrow represents the force of gravity on the skateboard(mg). The blue arrows are the FN or natural force of the ground pushing up on the wheels of the board. These forces have a net force of zero.
Sum of forces in Y: Mg  + mg - FN = 0


forces 2
As the skater prepares to ollie they lower the center of gravity by bending at the knees and waist. Next the skater will begin to explode in the positive Y direction by pressing down on the tail of the board. The red arrows now have an uneven distribution to the tail of the board causing lift on the nose. All of the FN  is now pushing up on the rear wheels.