Longboarding Down a Hill Longboarding on a flat road is fun, but the real thrill of the sport is bombing down huge hills.  The bigger the hill, the faster you go, and the more adrenaline will pump through your veins.  Let's explore the physics involved while barreling down a hill.     The equation used to represent motion downhill is a=g*sin(theta), where a is acceleration, g is gravity, and theta is the angle of the incline of the hill.  So the acceleration of the longboarder would be greater with a greater angle of theta, or a steeper hill.  Air resistance also plays a role in how fast a longboarder will travel down a hill.  In the picture shown above, the boarders are tucking, meaning their heads are down and their backs level, as well as their arms back to their sides.  This decreases the amount of drag caused by air resistance and allows to travel quicker down the slope.